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Symmetric Key and Public Key Encryption
 
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Modern day encryption is performed in two different ways. Check out http://YouTube.com/ITFreeTraining or http://itfreetraining.com for more of our always free training videos. Using the same key or using a pair of keys called the public and private keys. This video looks at how these systems work and how they can be used together to perform encryption. Download the PDF handout http://itfreetraining.com/Handouts/Ce... Encryption Types Encryption is the process of scrambling data so it cannot be read without a decryption key. Encryption prevents data being read by a 3rd party if it is intercepted by a 3rd party. The two encryption methods that are used today are symmetric and public key encryption. Symmetric Key Symmetric key encryption uses the same key to encrypt data as decrypt data. This is generally quite fast when compared with public key encryption. In order to protect the data, the key needs to be secured. If a 3rd party was able to gain access to the key, they could decrypt any data that was encrypt with that data. For this reason, a secure channel is required to transfer the key if you need to transfer data between two points. For example, if you encrypted data on a CD and mail it to another party, the key must also be transferred to the second party so that they can decrypt the data. This is often done using e-mail or the telephone. In a lot of cases, sending the data using one method and the key using another method is enough to protect the data as an attacker would need to get both in order to decrypt the data. Public Key Encryption This method of encryption uses two keys. One key is used to encrypt data and the other key is used to decrypt data. The advantage of this is that the public key can be downloaded by anyone. Anyone with the public key can encrypt data that can only be decrypted using a private key. This means the public key does not need to be secured. The private key does need to be keep in a safe place. The advantage of using such a system is the private key is not required by the other party to perform encryption. Since the private key does not need to be transferred to the second party there is no risk of the private key being intercepted by a 3rd party. Public Key encryption is slower when compared with symmetric key so it is not always suitable for every application. The math used is complex but to put it simply it uses the modulus or remainder operator. For example, if you wanted to solve X mod 5 = 2, the possible solutions would be 2, 7, 12 and so on. The private key provides additional information which allows the problem to be solved easily. The math is more complex and uses much larger numbers than this but basically public and private key encryption rely on the modulus operator to work. Combing The Two There are two reasons you want to combine the two. The first is that often communication will be broken into two steps. Key exchange and data exchange. For key exchange, to protect the key used in data exchange it is often encrypted using public key encryption. Although slower than symmetric key encryption, this method ensures the key cannot accessed by a 3rd party while being transferred. Since the key has been transferred using a secure channel, a symmetric key can be used for data exchange. In some cases, data exchange may be done using public key encryption. If this is the case, often the data exchange will be done using a small key size to reduce the processing time. The second reason that both may be used is when a symmetric key is used and the key needs to be provided to multiple users. For example, if you are using encryption file system (EFS) this allows multiple users to access the same file, which includes recovery users. In order to make this possible, multiple copies of the same key are stored in the file and protected from being read by encrypting it with the public key of each user that requires access. References "Public-key cryptography" http://en.wikipedia.org/wiki/Public-k... "Encryption" http://en.wikipedia.org/wiki/Encryption
Views: 488001 itfreetraining
Hashing Algorithms and Security - Computerphile
 
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Audible free book: http://www.audible.com/computerphile Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/ Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 776678 Computerphile
Comparison of Encryption Algorithms
 
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This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459
Views: 1288 Udacity
Difference between Asymmetric Key and Symmetric Key Cryptography
 
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Difference between Asymmetric Key and Symmetric Key Cryptography Keywords: Asymmetric Key Cryptography Symmetric Key Cryptography Network Security Notes
RSA Cryptosystem Algorithm (Public Key Algorithm) in Hindi with Example
 
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RSA Cryptosystem Algorithm (Public Key Algorithm) in Hindi with Example Like FB Page - https://www.facebook.com/Easy-Engineering-Classes-346838485669475/ Complete Data Structure Videos - https://www.youtube.com/playlist?list=PLV8vIYTIdSna11Vc54-abg33JtVZiiMfg Complete Java Programming Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbL_fSaqiYpPh-KwNCavjIr Previous Years Solved Questions of Java - https://www.youtube.com/playlist?list=PLV8vIYTIdSnajIVnIOOJTNdLT-TqiOjUu Complete DBMS Video Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnYZjtUDQ5-9siMc2d8YeoB4 Previous Year Solved DBMS Questions - https://www.youtube.com/playlist?list=PLV8vIYTIdSnaPiMXU2bmuo3SWjNUykbg6 SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnb7av5opUF2p3Xv9CLwOfbq PL-SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnadFpRMvtA260-3-jkIDFaG Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4
Views: 115974 Easy Engineering Classes
Cipher Block Chaining (CBC) | Algorithm Modes in Cryptography
 
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In this network security video tutorial we will study and understand the working of Cipher Block Chaining (CBC) also known as CBC algorithm mode. Cipher Block Chaining (CBC) - 1. Chaining adds a feedback mechanism to a block cipher 2. The results of the encryption of the previous block are fed back into the encryption of the current block. 3. In the first step; the first block of plain text and a random block of text, called Initialization Vector (IV) is used. 4. The IV has no special meaning it is simply used to make each message unique. 5. The value of IV is generated randomly. Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials Simple Snippets Official Website - http://simplesnippets.tech/ Simple Snippets on Facebook - https://www.facebook.com/simplesnippets/ Simple Snippets on Instagram - https://www.instagram.com/simplesnippets/ Simple Snippets on Twitter - https://twitter.com/simplesnippet Simple Snippets Google Plus Page - https://plus.google.com/+SimpleSnippets Simple Snippets email ID - [email protected] For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/ #CipherBlockChaining #AlgorithmModes #NetworkSecurity #Cryptography #BlockCiphers
Views: 4535 Simple Snippets
Cryptographic Algorithms
 
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On the next link you can read more about this topic: http://scienceup.org/computer-science/cryptographic-algorithms/
Views: 357 ScienceUp.org
How secure is 256 bit security?
 
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Supplement to the cryptocurrency video: How hard is it to find a 256-bit hash just by guessing and checking? What kind of computer would that take? Cryptocurrency video: https://youtu.be/bBC-nXj3Ng4 Home page: https://www.3blue1brown.com/ Several people have commented about how 2^256 would be the maximum number of attempts, not the average. This depends on the thing being attempted. If it's guessing a private key, you are correct, but for something like guessing which input to a hash function gives the desired output (as in bitcoin mining, for example), which is the kind of thing I had in mind here, 2^256 would indeed be the average number of attempts needed, at least for a true cryptographic hash function. Think of rolling a die until you get a 6, how many rolls do you need to make, on average? Music by Vince Rubinetti: https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown ------------------ 3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe, and click the bell to receive notifications (if you're into that). If you are new to this channel and want to see more, a good place to start is this playlist: http://3b1b.co/recommended Various social media stuffs: Website: https://www.3blue1brown.com Twitter: https://twitter.com/3Blue1Brown Patreon: https://patreon.com/3blue1brown Facebook: https://www.facebook.com/3blue1brown Reddit: https://www.reddit.com/r/3Blue1Brown
Views: 1044965 3Blue1Brown
Types of Cryptography
 
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This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459
Views: 4518 Udacity
Cryptography and Steganography(BCA, MCA)
 
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In this video Renu Pareek explains What is STEGANOGRAPHY? What does STEGANOGRAPHY mean? STEGANOGRAPHY meaning & explanation Thanks for watching and commenting. If you like our video you can Subscribe Our Youtube Channel here https://www.youtube.com/user/gurukpobiyanicollege?sub_confirmation=1 And You can also Subscribe to our Biyani TV Channel for quality videos about Fashion Lifestyle, Current affairs and many useful topics https://www.youtube.com/channel/UC50P... Gurukpo.com is the fastest growing educational web portal where all kind of academic information/Notes are available free of cost. For more details visit http://www.gurukpo.com These Videos are produced by Biyani Group of Colleges Jaipur, a fastest growing girls college in India. Visit http://www.biyanicolleges.org Share, Support, Subscribe!!! Subscribe: https://goo.gl/3gBszC Youtube: https://goo.gl/cjbbuL Twitter: https://twitter.com/drsanjaybiyani Facebook: https://www.facebook.com/drsanjaybiyani/ Instagram: https://www.instagram.com/prof.sanjay... Website : http://www.sanjaybiyani.com http://www.biyanitimes.com
Views: 6045 Guru Kpo
Famous UNCRACKED Codes That STILL Exist!
 
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Check out these famous uncracked codes that still exist! From secret riddles to unsolved mysteries, this top 10 list contains cryptography that's still unexplained today! Subscribe For New Videos! http://goo.gl/UIzLeB Watch our "Most CRAZY Things Ancient Egyptians Did!" video here: https://youtu.be/T0zERiMJFQo Watch our "Most CRAZY Things Ancient Greeks Did!" video here: https://youtu.be/-JkhVvn_dow Watch our "REAL Evidence That Aliens EXIST!" video here: https://youtu.be/dtwJT2eilx0 10. Chinese Gold Bar Cipher In 1933, General Wang in Shanghai, China, allegedly received seven gold bars. These gold bars appear to represent metal certificates related to a bank deposit with a U.S. Bank. The gold bars themselves have pictures, Chinese writing, some form of script writing, and cryptograms in Latin letters. Not surprisingly, experts debate concerning the validity of the claim for the deposit. It may help to resolve the dispute if someone can decipher the cryptograms on the bars. Someone translated the Chinese writing, which discusses a transaction in excess of $300,000,000. It also refers to these gold bars, which weigh a total of 1.8 kilograms. The rest remains a mystery. 9. D’agapeyeff Cipher The D’Agapeyeff cipher is an as-yet unbroken cipher that appears in the first edition of Codes and Ciphers, an elementary book on cryptography published by the Russian-born English cartographer Alexander D’Agapeyeff in 1939. Offered as a “challenge cipher” at the end of the book, it was not included in later editions. D’Agapeyeff supposedly admitted later to having forgotten how he had encrypted it. Some argue that the failure of all attempts at decryption is due to D’Agapeyeff incorrectly encrypting the original text. However, it has also been argued that the cipher may still be successfully attacked using computational methods such as genetic algorithms. Whatever those are. 8. The Beale Ciphers If this next one isn’t a hoax then the person who solves it could become very, very rich. This question of authenticity has bothered cryptoanalysts ever since these ciphers first appeared in an 1885 pamphlet called The Beale Papers, which recounts a fantastic story of buried treasure. According to the pamphlet, a man named Thomas Jefferson Beale, a man no one has proven even existed, discovered gold during an 1816 expedition into the American West. The treasure, as the story goes, was then transported to Bedford County, Virginia, and buried. The gold's secret location was allegedly provided by three cryptograms, of which one was already cracked. Unfortunately, the cracked code only detailed the type of treasure there and not a specific location. To find out anything more specific would involve cracking the two other ciphers. The problem is that figuring it out requires comparing them to unknown historical texts. The decrypted cipher, for example, used the Declaration of Independence. The first number, 115, corresponds with the first letter of the 115th word in the Declaration: "instituted." That means 115 stands for "I." So what are the translation texts for the other two ciphers? No one knows, and they may very well not exist at all. There are also questions over whether the other ciphers may just be unintelligible, as if the whole thing was made up by the pamphlet's author decades after the gold was supposed to have been discovered. 7. Dorabella In 1897, a 40-year-old composer named Edward Elgar sent an encrypted letter to 23-year-old Dora Penny, the stepdaughter of one of his friends. Why he sent it is part of the mystery and can only be answered if anyone ever cracks the code. To figure it out would involve deciphering 87 characters all made of strings of semi-circles oriented in different directions. Attempts at translating the cipher yielded a message just short of gibberish. Experts say that shorter ciphers are always harder to solve. Another theory has it that the code is an example of a distinct private language shared only between Penny and Elgar. If that's the case, then solving it may be simply impossible, since no one but them would understand the references. In 2016, a police officer in Cleveland believes he’s cracked at least part of the code, revealing a line of melody. Inspector Mark Pitt read 100 books on the Dorabella Cipher; he hopes to write one on his discoveries. Whether or not that’s really the meaning, though, remains to be seen. Origins Explained is the place to be to find all the answers to your questions, from mysterious events and unsolved mysteries to everything there is to know about the world and its amazing animals!
Views: 1265179 Origins Explained
Explained HTTP, HTTPS, SSL/TLS
 
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Visit https://bugcrowd.com/jackktutorials to get started in your security research career! Remember to Like, Comment and Subscribe if you enjoyed the video! Also share if you know someone who would also like this video! Please disable Adblock to help me and other YouTubers out! Want to ask me a question? Post it on my forum thread here: http://bit.ly/AskJackkTutorials - Every Saturday I do Ask Me! In this episode of Explained! we take a look at HTTP, HTTPS & SSL/TLS and learn how the World Wide Web works ▂▃▅▆▇█ Resources used in this video █▇▆▅▃▂ HTTP - https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol SSL - http://info.ssl.com/article.aspx?id=10241 ▂▃▅▆▇█ Contact Details █▇▆▅▃▂ Email (Jackk): [email protected] Website: http://www.jackktutorials.com Forums: http://www.jackktutorials.com/forums ▂▃▅▆▇█Music used in this video █▇▆▅▃ Intro - Mr Robot Opening Theme
Views: 149330 JackkTutorials
What is PUBLIC-KEY CRYPTOGRAPHY? What does PUBLIC-KEY CRYPTOGRAPHY mean?
 
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What is PUBLIC-KEY CRYPTOGRAPHY? What does PUBLIC-KEY CRYPTOGRAPHY mean? PUBLIC-KEY CRYPTOGRAPHY meaning - PUBLIC-KEY CRYPTOGRAPHY definition - PUBLIC-KEY CRYPTOGRAPHY explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. Public-key cryptography, or asymmetric cryptography, is any cryptographic system that uses pairs of keys: public keys that may be disseminated widely paired with private keys which are known only to the owner. There are two functions that can be achieved: using a public key to authenticate that a message originated with a holder of the paired private key; or encrypting a message with a public key to ensure that only the holder of the paired private key can decrypt it. In a public-key encryption system, any person can encrypt a message using the public key of the receiver, but such a message can be decrypted only with the receiver's private key. For this to work it must be computationally easy for a user to generate a public and private key-pair to be used for encryption and decryption. The strength of a public-key cryptography system relies on the degree of difficulty (computational impracticality) for a properly generated private key to be determined from its corresponding public key. Security then depends only on keeping the private key private, and the public key may be published without compromising security. Public-key cryptography systems often rely on cryptographic algorithms based on mathematical problems that currently admit no efficient solution—particularly those inherent in certain integer factorization, discrete logarithm, and elliptic curve relationships. Public key algorithms, unlike symmetric key algorithms, do not require a secure channel for the initial exchange of one (or more) secret keys between the parties. Because of the computational complexity of asymmetric encryption, it is usually used only for small blocks of data, typically the transfer of a symmetric encryption key (e.g. a session key). This symmetric key is then used to encrypt the rest of the potentially long message sequence. The symmetric encryption/decryption is based on simpler algorithms and is much faster. Message authentication involves hashing the message to produce a "digest," and encrypting the digest with the private key to produce a digital signature. Thereafter anyone can verify this signature by (1) computing the hash of the message, (2) decrypting the signature with the signer's public key, and (3) comparing the computed digest with the decrypted digest. Equality between the digests confirms the message is unmodified since it was signed, and that the signer, and no one else, intentionally performed the signature operation — presuming the signer's private key has remained secret. The security of such procedure depends on a hash algorithm of such quality that it is computationally impossible to alter or find a substitute message that produces the same digest - but studies have shown that even with the MD5 and SHA-1 algorithms, producing an altered or substitute message is not impossible. The current hashing standard for encryption is SHA-2. The message itself can also be used in place of the digest. Public-key algorithms are fundamental security ingredients in cryptosystems, applications and protocols. They underpin various Internet standards, such as Transport Layer Security (TLS), S/MIME, PGP, and GPG. Some public key algorithms provide key distribution and secrecy (e.g., Diffie–Hellman key exchange), some provide digital signatures (e.g., Digital Signature Algorithm), and some provide both (e.g., RSA). Public-key cryptography finds application in, among others, the information technology security discipline, information security. Information security (IS) is concerned with all aspects of protecting electronic information assets against security threats. Public-key cryptography is used as a method of assuring the confidentiality, authenticity and non-repudiability of electronic communications and data storage.
Views: 836 The Audiopedia
symmetric key cryptography
 
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https://8gwifi.org/CipherFunctions.jsp Reference book: http://leanpub.com/crypto Cryptographic Algorithms generally fall into one of two different categories, or are a combination of both. Symmetric Fast Only provide confidentiality Examples: DES, AES, Blowfish, RC4, RC5 Asymmetric Large mathematical operations make it slower than symmetric algorithms No need for out of band key distribution (public keys are public!) Scales better since only a single key pair needed per individual Can provide authentication and nonrepudiation Examples: RSA, El Gamal, ECC, Diffie-Hellman problem with symmetric key cryptography DES (Data Encryption Standard) 64 bit key that is effectively 56 bits in strength Actual algorithm is called DEA (Data Encryption Algorithm) DES Modes Electronic Code Book Cipher Block Chaining (most commonly used for general purpose encryption) Cipher Feedback Output Feedback Counter Mode (used in IPSec) 3DES 112-bit effective key length Uses either 2 or 3 different smaller keys in one of several modes Modes EEE2/3 EDE2/3 AES NIST replaced DES in 1997 with this Uses the Rijndael algorithm Supports key/block sizes of 128, 192, and 256 bits Uses 10/12/14 rounds as block size increases IDEA (International Data Encryption Algorithm) Operates on 64 bit blocks in 8 rounds with 128 bit key Considered stronger than DES and is used in PGP Blowfish 64 bit block cipher with up to 448 bit key and 16 rounds Designed by Bruce Schneier RC4 Stream cipher with variable key size created by Ron Rivest RC5 Another Rivest cipher Block cipher with 32/64/128 bit blocks and keys up to 2048 bits RC6 Beefier version of RC5 submitted as AES candidate CAST 64 bit block cipher with keys between 40-128 bits with 12-16 rounds depending on key length CAST-256 used 128-bit blocks and keys from 128-256 bits using 48 rounds SAFER (Secure and Fast Encryption Routine) Set of patent-free algorithms in 64 and 128 bit block variants Variation used in Bluetooth Twofish Adapted version of Blowfish with 128 bit blocks, 128-256 bit keys and 16 rounds AES Finalist Kryptografie mit symmetrischem Schlüssel symmetric key cryptography symmetric key cryptography tutorial symmetric key cryptography example symmetric key cryptography vs asymmetric key cryptography symmetric and asymmetric key cryptography symmetric key cryptography Kryptografie mit symmetrischem Schlüssel Kryptographie mit symmetrischem Schlüssel Kryptographie mit symmetrischem Schlüssel Kryptografie mit symmetrischem Schlüssel und asymmetrische Schlüsselkryptographie symmetrische und asymmetrische Schlüsselkryptographie Kryptografie mit symmetrischem Schlüssel
Views: 41880 Zariga Tongy
The concept of symmetric and asymmetric cryptography
 
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In this Video, Dr. Seema Batra, Assistant professor, Biyani Groups of Colleges, Jaipur, explains about the concept of symmetric and asymmetric cryptography. http://www.gurukpo.com/ http://www.biyanicolleges.org/
Views: 12906 Guru Kpo
0406 AES, DES, 3DES
 
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Views: 13532 sonu123kashni
NETWORK SECURITY - MD5 ALGORITHM
 
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The MD5 algorithm is a widely used hash function producing a 128-bit hash value. Step 1. Append Padding Bits. The message is "padded" (extended) so that its length (in bits) is congruent to 448, modulo 512. ... Step 2. Append Length. ... Step 3. Initialize MD Buffer Step 4. Process Message in 16-Word Blocks. ... Step 5. Output.
21. Cryptography: Hash Functions
 
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MIT 6.046J Design and Analysis of Algorithms, Spring 2015 View the complete course: http://ocw.mit.edu/6-046JS15 Instructor: Srinivas Devadas In this lecture, Professor Devadas covers the basics of cryptography, including desirable properties of cryptographic functions, and their applications to security. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 74376 MIT OpenCourseWare
Diffie Hellman Algorithm with solved example
 
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In this video I explained Diffie Hellman Algorithm with solved Numerical problem. Video is about how two persons can exchange their secret key. Notes link : https://drive.google.com/file/d/1_T5PVcl5NfR_S9p9MEwD42cS2YqN97FJ/view?usp=drivesdk If you have any doubts then you can connect me via: Email : [email protected] Contact : 7030994979
Views: 6330 Exam Partner
The Twofish Encryption Algorithm
 
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Twofish is a block cipher by Counterpane Labs, published in 1998. It was one of the five Advanced Encryption Standard (AES) finalists, and was not selected as AES. Twofish has a 128-bit block size, a key size ranging from 128 to 256 bits, and is optimized for 32-bit CPUs. Currently there is no successful cryptanalysis of Twofish. https://www.schneier.com/academic/twofish/ This animation is designed by Abdullah AlQahtani [email protected]
Views: 11473 Hemaya Group
How SSL works tutorial - with HTTPS example
 
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How SSL works by leadingcoder. This is a full tutorial how to setup SSL that requires client certificate for reference: http://www.windowsecurity.com/articles/Client-Certificate-Authentication-IIS6.html .
Views: 1427934 tubewar
Hill Cipher in Hindi – Complete Algorithm with Example
 
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Hill Cipher in Hindi – Complete Algorithm with Example Like FB Page - https://www.facebook.com/Easy-Engineering-Classes-346838485669475/ Complete Data Structure Videos - https://www.youtube.com/playlist?list=PLV8vIYTIdSna11Vc54-abg33JtVZiiMfg Complete Java Programming Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbL_fSaqiYpPh-KwNCavjIr Previous Years Solved Questions of Java - https://www.youtube.com/playlist?list=PLV8vIYTIdSnajIVnIOOJTNdLT-TqiOjUu Complete DBMS Video Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnYZjtUDQ5-9siMc2d8YeoB4 Previous Year Solved DBMS Questions - https://www.youtube.com/playlist?list=PLV8vIYTIdSnaPiMXU2bmuo3SWjNUykbg6 SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnb7av5opUF2p3Xv9CLwOfbq PL-SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnadFpRMvtA260-3-jkIDFaG Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4
Image Steganography with 3 Way Encryption
 
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Get this project system at http://nevonprojects.com/3-way-encryption-image-staganography/
Views: 13509 Nevon Projects
Hashing Techniques Hash Function, Types of Hashing Techniques in Hindi and English
 
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Hashing Techniques Hash Function, Types of Hashing Techniques in Hindi and English * Direct Hashing * Modulo-Division Hashing * Mid-Square Hashing * Folding Hashing - Fold-Shift Hashing and Fold Boundary Hashing * PseudoRandom Hashing * Subtraction Hashing For Students of B.Tech, B.E, MCA, BCA, B.Sc., M.Sc., Courses - As Per IP University Syllabus and Other Engineering Courses
Views: 243931 Easy Engineering Classes
22. Cryptography: Encryption
 
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MIT 6.046J Design and Analysis of Algorithms, Spring 2015 View the complete course: http://ocw.mit.edu/6-046JS15 Instructor: Srinivas Devadas In this lecture, Professor Devadas continues with cryptography, introducing encryption methods. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 17533 MIT OpenCourseWare
Cryptography and Network Security - Hash Functions - GATE Computer Science
 
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The complete YouTube playlist can be viewed here: https://goo.gl/mjyDev This lesson explains the concept of the Hash Functions, under the course, "Cryptography and Network Security for GATE Computer Science Engineering". The lesson explains the questions on the following subtopics: Hash Functions Hash Functions - Method 1 to 6 Some important terminology and concepts are also illustrated, for the better understanding of the subject. For the entire course: https://goo.gl/aTMBNZ For more lessons by Ansha Pk: https://goo.gl/2DX9Wn Must watch for all the GATE/ESE/PSU Exams. Download the Unacademy Learning App from the Google Play Store here:- https://goo.gl/02OhYI Download the Unacademy Educator app from the Google Play Store here: https://goo.gl/H4LGHE Do Subscribe and be a part of the community for more such lessons here: https://goo.gl/UGFo7b Visit Our Facebook Group on GATE here: https://goo.gl/cPj5sb Cryptography and Network Security - Hash Functions - GATE Computer Science
DES -- The Algorithm
 
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DES -- Data Encryption Standard -- has been the workhorse of modern cryptography for many decades. It has never been compromised mathematically (not in the open literature, at least), yet, its design notes were never made public either. Many who use it are unaware of how it works. Here we open the DES box and find inside a repetition of sub-boxes in which very simple primitives are at work: substitution, transposition, split, concatenation, and bit-wise operation. DES inside teaches us that complexity is comprised of a lot of simplicity.
Views: 144615 Gideon Samid
SHA-1 (Secure hash Algorithm) working in English  | CSS series
 
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Take the full crash course of Cryptography and Security System for free at Last moment tuitions Full course : https://lastmomenttuitions.com/course/cryptography-and-system-security/ Sample Notes :https://goo.gl/QpZPF5 For full hand made notes of Artificial Intelligence its only 100 rs payment options is PAYTM :9762903078 once we get payment notification we will mail you the notes on your email id contact us at :[email protected] whatsapp :9762903078 apko koi bhi doubt ho toh app humko direct email ya phone kar sakte ho Cryptography and security systems Series introduction to CSS: https://goo.gl/tjrh1L security goals and mechanism:https://goo.gl/uq35hP symmetric cipher:https://goo.gl/KFxF9j Substitution cipher and its types:https://goo.gl/MKmPzk Transposition cipher:https://goo.gl/uHqD7i diffie -hellman: https://goo.gl/YrskC5 RSA Algorithm:https://goo.gl/KwzCBF Kerberos:https://goo.gl/MQPgzw IDEA algorithm : https://goo.gl/PTCqFH Dos and DDos attack: https://goo.gl/8T345G SQL injection:https://goo.gl/bcVHnw SHA-1 vs MD5 :https://goo.gl/QJBhJD chalo toh public bus pass hojao aur share karo videos ko whatsapp group apne last moment pe unn dosto ko jo apni tarah last moment pe padhte hai Aur videos CSS ke aane waale hai so Channel ko subscribe jaroor karna follow us on: https://www.instagram.com/last_moment_tuitions https://www.facebook.com/lastmomenttuition https://www.facebook.com/sumerr3
Views: 75984 Last moment tuitions
Secure Hash Algorithm
 
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This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459
Views: 28166 Udacity
MAC in Hindi - Message Authentication Code Process, Significance, HMAC Concept
 
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MAC in Hindi - Message Authentication Code Process, Significance, HMAC Concept - Network Security #MAC Lectures #HMAC Lecture #CNS Lectures
Hashing (OTP) / Hash fuction (meaning and introduction) cryptography and network security in hindi.
 
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Please Fill the form - https://docs.google.com/forms/d/1kOxvqvz1IvBMHJ3UeLecLDuK7ePKjHAvHaRcxduHKEE/edit ====================================================== Answer of your Questions Asked to me. (direct Link given below) Blogger Link - http://shalik-htd.blogspot.com/ ====================================================== Hey, friends, I upload the videos in this channel in Hindi for Engineering student of UPTU and other universities for computer science and IT (information technology) students. like share and subscribe my channel ====================================================== Install C Programming Solution Android app - https://play.google.com/store/apps/details?id=com.shalik.patel.cprogrammingsolution ====================================================== ====================================================== My Career Planning android app - https://play.google.com/store/apps/details?id=guide.mycareer.com.rec.mycareer ====================================================== ====================================================== My Android App for my College Library (An Official App Of College Library) - https://play.google.com/store/apps/details?id=jrv.library.rec.reclibrary ====================================================== How to use android application - https://www.youtube.com/watch?v=1hMZCvl-JxM ====================================================== Contact me on Facebook - https://www.facebook.com/HTD-hub-250593705388294/?ref=br_rs ====================================================== Follow me on twitter - https://twitter.com/PatelShalik ======================================================
Ever wonder how Bitcoin (and other cryptocurrencies) actually work?
 
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Bitcoin explained from the viewpoint of inventing your own cryptocurrency. Home page: https://www.3blue1brown.com/ Special thanks to these supporters: http://3b1b.co/btc-thanks Protocol Labs: https://protocol.ai/ Interested in contributing? https://protocol.ai/join/ Some people have asked if this channel accepts contributions in cryptocurrency form. Indeed! http://3b1b.co/crypto 2^256 video: https://youtu.be/S9JGmA5_unY Music by Vincent Rubinetti: https://soundcloud.com/vincerubinetti/heartbeat Here are a few other resources I'd recommend: Original Bitcoin paper: https://bitcoin.org/bitcoin.pdf Block explorer: https://blockexplorer.com/ Blog post by Michael Nielsen: https://goo.gl/BW1RV3 (This is particularly good for understanding the details of what transactions look like, which is something this video did not cover) Video by CuriousInventor: https://youtu.be/Lx9zgZCMqXE Video by Anders Brownworth: https://youtu.be/_160oMzblY8 Ethereum white paper: https://goo.gl/XXZddT If you want to contribute translated subtitles or to help review those that have already been made by others and need approval, you can click the gear icon in the video and go to subtitles/cc, then "add subtitles/cc". I really appreciate those who do this, as it helps make the lessons accessible to more people. Music by Vince Rubinetti: https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown ------------------ 3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe, and click the bell to receive notifications (if you're into that). If you are new to this channel and want to see more, a good place to start is this playlist: http://3b1b.co/recommended Various social media stuffs: Website: https://www.3blue1brown.com Twitter: https://twitter.com/3Blue1Brown Patreon: https://patreon.com/3blue1brown Facebook: https://www.facebook.com/3blue1brown Reddit: https://www.reddit.com/r/3Blue1Brown
Views: 2504305 3Blue1Brown
Cryptography - defined
 
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Cryptography is the branch of mathematics that lets you create mathematical proofs that provide high levels of security. Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in practice by any adversary. It is theoretically possible to break such a system but it is infeasible to do so by any known practical means. Reference: http://en.wikipedia.org/wiki/Cryptography Created at http://www.b2bwhiteboard.com
Views: 106 JargoTerms
Checksum
 
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Checksum is a method of checking for errors in a communications system. I'm Mr. Woo and my channel is all about learning - I love doing it, and I love helping others to do it too. I guess that's why I became a teacher! I hope you get something out of these videos - I upload almost every weekday, so subscribe to find out when there's something new! For categorised playlists: http://www.misterwootube.com Main channel: http://youtube.com/misterwootube Discussion: http://facebook.com/misterwootube Worksheets and other resources: http://woo.jamesruse.nsw.edu.au
Views: 169023 Eddie Woo
MD5 in Hindi - Message Digest, Hash Functions, Working and Operation of MD5 - Network Security
 
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MD5 in Hindi - Message Digest, Hash Functions, Working and Operation of MD5 - Network Security Hash Functions – Features, Properties, Working of MD5, Operation of MD5 #MD5 Computer Network Security(CNS) Lectures – Internet Security
What is KEY STRETCHING? What does KEY STRETCHING mean? KEY STRETCHING meaning & explanation
 
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What is KEY STRETCHING? What does KEY STRETCHING mean? KEY STRETCHING meaning - KEY STRETCHING definition - KEY STRETCHING explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ In cryptography, key stretching techniques are used to make a possibly weak key, typically a password or passphrase, more secure against a brute force attack by increasing the time it takes to test each possible key. Passwords or passphrases created by humans are often short or predictable enough to allow password cracking. Key stretching makes such attacks more difficult. Key stretching techniques generally work as follows. The initial key is fed into an algorithm that outputs an enhanced key. The enhanced key should be of sufficient size to make it infeasible to break by brute force (e.g. at least 128 bits). The overall algorithm used should be secure in the sense that there should be no known way of taking a shortcut that would make it possible to calculate the enhanced key with less processor work than by using the key stretching algorithm itself. The key stretching process leaves the attacker with two options: either try every possible combination of the enhanced key (infeasible if the enhanced key is long enough), or else try likely combinations of the initial key. In the latter approach, if the initial key is a password or a passphrase, then the attacker would first try every word in a dictionary or common password list and then try all character combinations for longer passwords. Key stretching does not prevent this approach, but the attacker has to spend much more time on each attempt. If the attacker uses the same class of hardware as the user, each guess will take the same amount of time to process as it took the user (for example, one second). Even if the attacker has much greater computing resources than the user, the key stretching will still slow the attacker down, since the user's computer only has to compute the stretching function once upon the user entering their password, whereas the attacker must compute it for every guess in the attack. There are several ways to perform key stretching. A cryptographic hash function or a block cipher may be repeatedly applied in a loop. In applications where the key is used for a cipher, the key schedule in the cipher may be modified so that it takes a specific length of time to perform. A related technique, salting, protects against time-memory tradeoff attacks and is often used in conjunction with key stretching.
Views: 253 The Audiopedia
Encryption and Hashing explanation and differences in 5 minutes
 
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A very basic level and almost non technical explanation of the terms encryption and hashing
Views: 1965 Imran Hossain
How Bitcoin Works Under the Hood
 
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A somewhat technical explanation of how Bitcoin works. Want more? Check out my new in-depth course on the latest in Bitcoin, Blockchain, and a survey of the most exciting projects coming out (Ethereum, etc): https://app.pluralsight.com/library/courses/bitcoin-decentralized-technology Lots of demos on how to buy, send, store (hardware, paper wallet). how to use javascript to send bitcoin. How to create Ethereum Smart Contract, much more. Shorter 5 min introduction: https://www.youtube.com/watch?v=t5JGQXCTe3c Written version: http://www.imponderablethings.com/2013/07/how-bitcoin-works-under-hood.html My Bitcoin address: 13v8NB9ScRa21JDi86GmnZ5d8Z4CjhZMEd Arabic translation by Ahmad Alloush Spanish caption translation by Borja Rodrigo, [email protected], DFJWgXdBCoQqo4noF4fyVhVp8R6V62XdJx Russian caption translation by Alexandra Miklyukova Italian voice over: http://youtu.be/1aEf3qr7UdE Italian captions translated by Simone Falcini, 1H5KdCnBooxfqpXtyQBBAKKRU7MkCZCVCe
Views: 2665086 CuriousInventor
Guide to Applications of Homomorphic Encryption
 
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Homomorphic encryption is an encryption function which permits encrypted data to be computed without decryption. It is considered as a solution for protecting privacy information in present situations such as cloud computing and machine communication. In this talk, I explain the basic arithmetics under homomorphic encryption: equality and comparison. Then I show how to apply to real world problems: private database query processing and homomorphic computation of (approximate) edit distance for genomic analysis.
Views: 1691 Microsoft Research
Hybrid Algorithm for secure data over Cloud OS
 
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Sharing resources in a cost effective way between large companies makes cloud computing more popular day after day. It is an advanced platform for the users to access computing services any- time and from anywhere. This is the only service which integrates,optimizes and provides computing jobs by the way of renting resources and services. The higher the demand more the growing threat of security becoming an issue. One such issue is to regards of protecting the data transferred between different people and organizations. The Advanced Encryption Standard and the Rivest-Shamir-Adleman (RSA) algorithms are the most used and popular encryption methods that are reliable when it comes to confidentiality and authenticity. We a trying to implement a hybrid algorithm which is 100-1000 times faster than the normal standard keys used in the present day in an organization running Cloud Services with the use of eyeOS in their company.
Views: 1043 Avinash pasupuleti
Symmetric encryption
 
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Symmetric encryptionSymmetric encryption algorithms are based on one and the same key used by a sender and a recipient. The information exchange process includes three stages: - a sender sends a key to a recipient; - using this key, the sender encrypts the message and forwards it to the recipient; - the recipient receives the message and decrypts it.A number of factors account for the security level provided by conventional techniques: - Firstly, the encryption algorithm should be reliable enough so that the encrypted message could not be decrypted without the key; - Secondly, the security of the transmitted message should depend on the key only rather than on the algorithm secrecy; - And thirdly, the algorithm should prevent from learning the key even if you know a lot of encrypted/unencrypted pairs.For example, the well-known Caesar cipher is quite easy to decipher, even if you don't know the key. Let me demonstrate you how: - We write a decrypted text; - Then we write the decrypted alphabet under the text; - Then we can read the text going from line to line.However, unlike Caesar cipher, if, instead of a constant shift, we use a variable shift which also changes from message to message, we will get rather a reliable encryption system.This method of encryption is called Vigenère cipher. The shift value is defined by a key word which is usually placed in the beginning of a message. The shift is determined by comparing the key word with the transmitted word. For instance, our key word is LASER. The transmitted word will be as follows:In this event the key will be as follows:Symmetric encryption offers such advantages as high data transmission rate, simple implementation, quite a small key length, and sufficient reliability.Symmetric encryption has one substantial shortcoming. It is useless for authentication as the key is known to both parties.
Views: 1175 ChipDipvideo
Asymmetric Encryption
 
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This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459
Views: 851 Udacity
Cryptcat: Netcat Using Two-Fish Encryption, HakTip 88
 
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This week on HakTip Shannon is trying out Cryptcat, Netcat with Encryption! Cryptcat is another command line tool that is built on top of Netcat and works almost exactly the same. We've discussed the fact that Netcat usage is transmitted in plain text, meaning there is no encryption and anyone can see what you are doing across computers. Cryptcat gives you a version of Netcat using two-fish encryption. I was able to download it on my Linux Mint machine by simply typing into the terminal: sudo apt-get install cryptcat. Now type Cryptcat -h. You'll notice that a lot of the options for Cryptcat are the same as Netcat. It also uses the same commands. Here's an example for you: On my computer - I type "cryptcat -k mypassword 10.73.31.124 1337". Cryptcat opens cryptcat. -k does enables the password or the symmetric key (which means both of us need to know that key). The next word if my password, then the ip address of the other computer. The last bit is my port. On Darren's computer, he will type "cryptcat -k mypassword -l -p 1337". Cryptcat again, opens cryptcat. -k does enabled the password. Again, Darren puts in our shared password, then -l listens. -p 1337 means listen on port 1337. Now on to the fun part. Cryptcat says it's encrypted. I'm going to open wireshark with "gksudo wireshark &" to make sure. I'll choose eth0 for my LAN, and type "tcp.port == 1337" into the filter box at the top. Now lets try chatting again. You'll notice a bunch of packets get transmitted between us, but all of them are encrypted. Now, if we chat via Netcat. I'll be the listener this time. Open with "nc -l -p 1337" and Darren uses "nc 10.73.31.107 1337". that's me! Now, lets go back to Wireshark and watch the packets roll in as we chat. You'll notice that these chats ARE NOT encrypted. Do you use Cryptcat? Send me a comment below or email us at [email protected] And be sure to check out our sister show, Hak5 for more great stuff just like this. I'll be there, reminding you to trust your technolust. -~-~~-~~~-~~-~- Please watch: "Bash Bunny Primer - Hak5 2225" https://www.youtube.com/watch?v=8j6hrjSrJaM -~-~~-~~~-~~-~-
Views: 19831 Hak5
Brute-Force Substring Search Algorithm
 
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Algorithms and Data Structures Masterclass: http://bit.ly/algorithms-masterclass-java Find more: www.globalsoftwaresupport.com
Views: 21795 Balazs Holczer
This is How Hackers Crack Passwords!
 
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In this video, we'll see how hackers really crack passwords. This video is edited with Filmora video editor, get it here : https://goo.gl/RtmNC5 DISCLAIMER : This video is intended only to educate people about how hackers crack passwords, and how important the strength of the password is, when coming to security. If you are using a common password like test123456 which I used in the video, then the hacker will easily be able to know the plain text form of your password from the hash string. There is something known as Rainbow tables. These rainbow tables contain the password hashes of numerous commonly used passwords. So the hacker will be to do a simple search with the password hash that he has, and if the password hash exists in the rainbow table, then that means the password is successfully cracked, and we have the password in a plain text. Remember that rainbow tables contain the password hashes of only the passwords which are commonly used. As a reference, you can go to https://crackstation.net/ If the password is not a commonly used password, then there comes dictionary attack and brute force attack. In dictionary attack, you have a wordlist. A wordlist is nothing but a huge text file with loads of passwords. In this attack, the hacker writes a code which compares the password hash to be cracked, with the password hash of each and every password that exists in the wordlist. Now, this attack can be target-specific as well. which means we can build a wordlist targeting an individual provided that we know some basic details about him/her. In a brute force attack, each and every combination of letters ,symbols and numbers are converted into their hash forms, and are then compared with the hash to be cracked. This is a more expensive. A new technique called salting is introduced by security analysts to give hackers a hard time in cracking passwords. In this technique, a specific combination of characters are inserted at specific positions of the plain text password before hashing. Every company has its own salting algorithm, and they don’t make their salting algorithm public For example, kets say Facebook salting algorithm inserts the string f&2p at the beginning, after the third character, and at the end of the plain text password. After salting the password, the salted password is then hashed by a hashing algorithm. So when salting is used, rainbow tables are of no use even if the password to be cracked is a weak commonly used password. Because the hashe of the password without salting do not match the hash of the password which is salted Also, brute force and dictionary attack are not effective to crack salted passwords unless the hacker already knows the salting algorithm employed by a company. Visit my website : https://techraj156.com Like my Facebook Page : https://fb.com/techraj156 Follow me on Instagram : https://instagram.com/teja.techraj Follow on Twitter : https://twitter.com/techraj156 For written tutorials, visit my blog : http://blog.techraj156.com SUBSCRIBE for more videos! Thanks for watching! Cheers!
Views: 6424859 Tech Raj
Elliptic Curve Cryptography & Diffie-Hellman
 
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Today we're going over Elliptic Curve Cryptography, particularly as it pertains to the Diffie-Hellman protocol. The ECC Digital Signing Algorithm was also discussed in a separate video concerning Bitcoin's cryptography.
Views: 54377 CSBreakdown
Secure Hash Algorithm Explained (SHA)
 
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In this video, you will see Secure Hash Algorithm (SHA) explained simply for beginners! Understanding the concept of a Secure Hash Algorithm (SHA) is crucial in order to understand blockchain, bitcoin, and other cryptocurrencies. The term "hashing" is thrown around everywhere, and I want to make it super clear what exactly this term means! Cited: Graphic from BlockGeeks, credit to them for that slide! ------------------------------------------------------------------------------------------------------------- Pick up a Ledger Nano S Here: https://www.ledgerwallet.com/r/b852?path=/products/ledger-nano-s&tracker=MY_TRACKER ------------------------------------------------------------------------------------------------------------- If you want to get in the cryptocurrency game, sign up for Coinbase with my referral link: https://www.coinbase.com/join/590795469dcf5f0906c65a13 ------------------------------------------------------------------------------------------------------------- Also, sign up for Binance with my referral link here: https://www.binance.com/?ref=23509073 ☮ Thank you for watching and joining the movement! I post weekly content about blockchain, cryptocurrency and more, including cryptocurrency investment tips, product reviews, and informative lessons, so please consider subscribing to get updated on the latest content! ☮ **-----------------------------------------------------------------------------------------------------DISCLAIMER: The information in this video is an opinion and is for informational purposes only. It is not intended to be investment advice, nor does it represent any entity's opinion but my own. Seek a duly licensed professional for investment advice. I am not guaranteeing you gains on your investment and this is just my own personal approach that I’ve had success with in investing in cryptocurrency. What I can guarantee, is that by using the above questions as your guide, make the most educated decisions possible while investing in cryptocurrency! Invest smart, ladies and gentlemen! This video and description may contain affiliate links, which means that if you click on one of the product links, I’ll receive a small commission. Most often, I include links to products when I do product reviews, but I will never push a product I do not use myself and totally believe in! The commission I receive for clicks is directly reinvested into the creation of great content on this channel, and I thank you for your support. I am @hashoshi4, engage with me on social media :) Twitter: http://bit.ly/2EDnBjp Facebook: http://bit.ly/2CvViW8 Instagram: http://bit.ly/2ECkecO *--------------------------------------------------------------------------------------------------------* I am Forrest Colyer, and I have studied blockchain and cryptocurrency obsessively over the last 7 years and worked as a blockchain developer for the past few years. It has been a wild ride and I'm excited about what the future holds! On this channel, I strive to share my experience with you in the form of blockchain tutorials, lessons, and stories as well as cryptocurrency news and investment hacks/tips. Thank you for watching and supporting me; Let's Hash It Out!
Views: 413 Hashoshi
SHA-1 Algorithm ( Cryptography & Network Security)
 
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Prof.V.Bibin Christopher Department of CSE Ponjesly College of Engineering
Views: 26513 ponjesly cse
Understanding the Key Verification Algorithm (Keygen part 3) - Pwn Adventure 3
 
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Part 17: This video might be a bit more boring reversing, and I even failed to recognise the implemented algorithm. 🌴 Playlist: https://www.youtube.com/playlist?list=PLhixgUqwRTjzzBeFSHXrw9DnQtssdAwgG -=[ 🔴 Stuff I use ]=- → Microphone:* https://amzn.to/2LW6ldx → Graphics tablet:* https://amzn.to/2C8djYj → Camera#1 for streaming:* https://amzn.to/2SJ66VM → Lens for streaming:* https://amzn.to/2CdG31I → Connect Camera#1 to PC:* https://amzn.to/2VDRhWj → Camera#2 for electronics:* https://amzn.to/2LWxehv → Lens for macro shots:* https://amzn.to/2C5tXrw → Keyboard:* https://amzn.to/2LZgCFD → Headphones:* https://amzn.to/2M2KhxW -=[ ❤️ Support ]=- → per Video: https://www.patreon.com/join/liveoverflow → per Month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join -=[ 🐕 Social ]=- → Twitter: https://twitter.com/LiveOverflow/ → Website: https://liveoverflow.com/ → Subreddit: https://www.reddit.com/r/LiveOverflow/ → Facebook: https://www.facebook.com/LiveOverflow/ -=[ 📄 P.S. ]=- All links with "*" are affiliate links. LiveOverflow / Security Flag GmbH is part of the Amazon Affiliate Partner Programm. #CTF #PwnAdventure #ReverseEngineering
Views: 31646 LiveOverflow

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