Search results “Cryptographically secure random function/generator php file”
Random bytes and  random int functions
Two new functions have been added to generate cryptographically secure integers and strings in a cross platform way: random_bytes() and random_int().
Views: 962 Avelx
High Capacity PHP Random String Generator Function Programming Tutorial
Lesson Code: http://www.developphp.com/video/PHP/Random-String-Generator-PHP-Function-Programming-Tutorial Learn to program a high capacity PHP random string generator with dynamic length parameter. We demonstrate how to then make your script modular in order for it to be reusable, external and dynamic. Splitting (str_split) any string gives you an array from that string, then you can pluck out elements of that array (array_rand) within a for loop in order to return a randomly generated string of characters of any length.
Views: 12632 Adam Khoury
JMS240: Secure User Authenticaion and Cryptographically Secure Tokens in PHP
A common problem in PHP is creating cryptographically secure tokens for user authentication. Think "remember me" and password reset features. Functions like rand(), mt_rand() and uniqid() simply aren't enough. And, without "resource-improbable" tokens... it's only a matter of time for a hacker to break your authentication and get int your application. Fortunately, PHP 5.6 and 7 have added the necessary functions for us to creating cryptographically secure tokens, prevent timing attacks and mitigate data hacks. That latest in all this in this episode. Show notes and sources: https://www.johnmorrisshow.com/240 #php #webdev
Views: 1313 John Morris
Black Hat USA 2012 - PRNG Pwning Random Number Generators (In PHP Applications)
By: George Argyros & Aggelos Kiayias We present a number of novel, practical, techniques for exploiting randomness vulnerabilities in PHP applications. We focus on the predictability of password reset tokens and demonstrate how an attacker can take over user accounts in a web application via predicting the PHP core randomness generators. Our suite of new techniques and tools go far beyond previously known attacks (e.g. Kamkar and Esser) and can be used to mount attacks against all PRNG of the PHP core system even when it is hardened with the Suhosin extension. Using them we demonstrate how to create practical attacks for a number of very popular PHP applications (including Mediawiki, Gallery, osCommerce and Joomla) that result in the complete take over of arbitrary user accounts. While our techniques are designed for the PHP language, the principles behind ]them are independent of PHP and readily apply to any system that utilizes weak randomness generators or low entropy sources. We will also release tools that assist in the exploitation of randomness vulnerabilities and exploits for some vulnerable applications.
Views: 1087 Black Hat
The Randomness Problem: How Lava Lamps Protect the Internet
Go to https://Brilliant.org/SciShow to get 20% off of an annual Premium subscription! Randomness is important for all kinds of things, from science to security, but to generate true randomness, engineers have turned to some pretty odd tricks! Hosted by: Stefan Chin Head to https://scishowfinds.com/ for hand selected artifacts of the universe! ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://www.wired.com/story/cloudflare-lava-lamps-protect-from-hackers/ https://sploid.gizmodo.com/one-of-the-secrets-guarding-the-secure-internet-is-a-wa-1820188866 https://www.fastcompany.com/90137157/the-hardest-working-office-design-in-america-encrypts-your-data-with-lava-lamps https://www.nytimes.com/2001/06/12/science/connoisseurs-of-chaos-offer-a-valuable-product-randomness.html https://blog.cloudflare.com/why-randomness-matters/ https://www.design-reuse.com/articles/27050/true-randomness-in-cryptography.html https://www.random.org/randomness/ https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-856j-randomized-algorithms-fall-2002/lecture-notes/ https://link.springer.com/chapter/10.1007/978-3-319-26300-7_3 https://www.maa.org/sites/default/files/pdf/upload_library/22/Ford/Volchan46-63.pdf https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-22r1a.pdf http://www.iro.umontreal.ca/~simardr/testu01/guideshorttestu01.pdf https://www.rand.org/pubs/monograph_reports/MR1418/index2.html https://www.rand.org/content/dam/rand/pubs/papers/2008/P113.pdf https://docs.microsoft.com/en-us/windows/desktop/secauthn/tls-handshake-protocol https://tools.ietf.org/html/rfc2246#page-47 https://ops.fhwa.dot.gov/trafficanalysistools/tat_vol3/vol3_guidelines.pdf https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-36-communication-systems-engineering-spring-2009/lecture-notes/MIT16_36s09_lec21_22.pdf https://telescoper.wordpress.com/2009/04/04/points-and-poisson-davril/ https://auto.howstuffworks.com/remote-entry2.htm https://web.archive.org/web/20070315010555/https://cigital.com/papers/download/developer_gambling.php Images: https://commons.wikimedia.org/wiki/File:Middle-square_method.svg https://www.youtube.com/watch?v=zdW6nTNWbkc https://commons.wikimedia.org/wiki/File:Sun-crypto-accelerator-1000.jpg
Views: 361843 SciShow
RSA Key Generation, Signatures and Encryption using OpenSSL
Demonstration of using OpenSSL to create RSA public/private key pair, sign and encrypt messages using those keys and then decrypt and verify the received messages. Commands used: openssl. Created by Steven Gordon on 7 March 2012 at Sirindhorn International Institute of Technology, Thammasat University, Thailand.
Views: 61894 Steven Gordon
Password Hashing, Salts, Peppers | Explained!
---------------------------------------------------------------------------------------------- Check out my site: http://www.seytonic.com Follow me on twitter: https://twitter.com/seytonic
Views: 57655 Seytonic
Secure your php session-03
Download the session class from https://github.com/hkmsadek/php-sessions- From this video, you will be able to learn how to use the sessions in php the correct way. You should never simply start a session. You need to keep on mind that it is not accessible via the js codes.
Views: 2108 letsruncode
Generating random numbers in Oracle
For more tutorial please visit #techquerypond https://techquerypond.com https://techquerypond.wordpress.com https://twitter.com/techquerypond
Views: 588 Tech Query Pond
PHP Tutorial: Secure Password Hashing using  crypt()
In this video lesson you will learn how to securely salt and hash user passwords for safe storage in your database. We will be going over how to use the PHP crypt() function and Blowfish algorithm as well as how to test user log in against the encrypted password. Lesson code available here: http://www.worldofwebcraft.com/blog.php?id=241 For more information on creating even stronger encryption for storing passwords using CRYPT_BLOWFISH check out this link: http://www.gotcode.org/blog.php?id=243
Views: 22447 Isaac Price
DEF CON 22 - Dan Kaminsky - Secure Random by Default
Secure Random By Default Dan Kaminsky Chief Scientist, White Ops As a general rule in security, we have learned that the best way to achieve security is to enable it by default. However, across operating systems and languages, random number generation is always exposed via two separate and most assuredly unequal APIs -- insecure and default, and secure but obscure. Why not fix this? Why not make JavaScript and PHP and Java and Python and even libc rand() return strong entropy? What are the issues stopping us? Should we just shell back to /dev/urandom, or is there merit to userspace entropy gathering? How does fork() and virtualization impact the question? What of performance, and memory consumption, and headless machines? Turns out the above questions are not actually rhetorical. Just because a change might be a good idea doesn't mean it's a simple one. This will be a deep dive, but one that I believe will actually yield a fix for the repeated *real world* failures of random number generation systems. Dan Kaminsky has been a noted security researcher for over a decade, and has spent his career advising Fortune 500 companies such as Cisco, Avaya, and Microsoft.Dan spent three years working with Microsoft on their Vista, Server 2008, and Windows 7 releases. Dan is best known for his work finding a critical flaw in the Internet’s Domain Name System (DNS), and for leading what became the largest synchronized fix to the Internet’s infrastructure of all time. Of the seven Recovery Key Shareholders who possess the ability to restore the DNS root keys, Dan is the American representative. Dan is presently developing systems to reduce the cost and complexity of securing critical infrastructure.
Views: 42278 DEFCONConference
Генерируем случайное число в PHP с помощью rand
echo rand(1,9999); Партнерская программа http://join.air.io/volmav
Views: 407 Maxim
43: Hashing and de-hashing data using PHP | PHP tutorial | Learn PHP programming
Hashing and de-hashing data using PHP | PHP tutorial. In this lesson you will learn about database data security, and how to hash and dehash data using PHP. In PHP we have a hash function which uses bcrypt, in order to protect data provided by our users. Login system tutorial (link starts at hashing part): https://youtu.be/xb8aad4MRx8?t=59m42s ➤ GET ACCESS TO MY LESSON MATERIAL HERE! First of all, thank you for all the support you have given me! I am really glad to have such an awesome community on my channel. It motivates me to continue creating and uploading content! So thank you! I am now using Patreon to share improved and updated lesson material, and for a small fee you can access all the material. I have worked hard, and done my best to help you understand what I teach. I hope you will find it helpful :) Material for this lesson: https://www.patreon.com/posts/php-43-download-15654480
Views: 34129 mmtuts
Salted Password Scheme - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 13598 Udacity
Random numbers and bytes with PHP7
Want more? Explore the library at https://www.codecourse.com/lessons Official site https://www.codecourse.com Twitter https://twitter.com/teamcodecourse
Views: 6067 Codecourse
Python code audit of a firmware update - 34C3 CTF software_update (crypto) part 1/2
This challenge from the 34C3 CTF implemented a software update in python. In part 1/2 we try to understand the code and think about possible attacks. software_update: https://archive.aachen.ccc.de/34c3ctf.ccc.ac/challenges/index.html What is CTF? https://www.youtube.com/watch?v=8ev9ZX9J45A Why you should play CTFs: https://www.youtube.com/watch?v=rfjV8XukxO8 -=[ 🔴 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. #Cryptography #CTF
Views: 28346 LiveOverflow
How to use md5 in PHP
What is md5 algorithm? The MD5 algorithm is a widely used hash function producing a 128-bit hash value.The MD5 hash function was originally designed for use as a secure cryptographic hash algorithm for authenticating digital signatures. MD5 has been deprecated for uses other than as a non-cryptographic checksum to verify data integrity and detect unintentional data corruption. -~-~~-~~~-~~-~- Please watch: "how to upload image/file into mysql using php by sbphptricks" https://www.youtube.com/watch?v=KgPh090Ifyo -~-~~-~~~-~~-~-
Views: 262 sbphptricks
USENIX Demo Dual-EC PRNG Attack
Demo of Dual-EC PRNG attack by Stephen Checkoway at USENIX info security conference in San Diego on 21 Aug 2014.
Views: 132 Jonathan Abolins
Random Tutorials - How to create a PHP Tracker
Download the files from here: http://www.mediafire.com/?t3nhbmztppwgamz Remember to subscribe and like this video. Thank you! For more visit http://jak3rzz.info/upload
Views: 3172 PenguinJak3
PHP Tutorial: Password Encryption with MD5, SHA1, and Crypt -HD-
In this tutorial, you will learn how to encrypt passwords and other data by using the md5, sha1, and crypt functions. Be sure to SUBSCRIBE because there will be a new tutorial every week. Follow me on Twitter @RiverCityGraphx Like us on on facebook: http://on.fb.me/i8UQpt Suggest tutorials at http://www.rivercitygraphix.com For project files, help forums, and more check out the website at http://www.rivercitygraphix.com For business related inquires contact us at [email protected]
Views: 41918 RiverCityGraphix
PHP : Generate Hash of String Using md5 function in php (In Hindi)
PHP By Pankaj Panjwani. Visit : http://www.yctacademy.blogspot.com.
Views: 383 Pankaj Panjwani
Simple homemade encryption algorithm
(Source code on request. UPDATE: See below) Made an encryption scheme that creates a square (padding random bytes if necessary) and shifts a square based on the password. Given the same password, it will perform the same shifts. Decryption uses the same algorithm but performs the actions backwards. Another version (shown second, starting at 0:53) also does character substitution. This basically adds up the values of each character of the password and each character of the data, modulus the length of the character set of course. After that it still performs shifting. It's not going to be used for anything at all ("rolling your own" is always an extremely bad idea in cryptography, I know that very well), I just enjoyed creating it. Just shifting the square around seems to give a pretty random outcome, and with character substitution you really can't tell what the original was. The algorithm also includes an extremely simple key derivation function which obfuscates the key input for a more random looking output (though the key needs not be fixed-length). It only accepts ASCII input, no accents or euro symbols or anything outside 32-127. It's not meant to be really used anyway. Again, source available on request. Note that I can't comment because then I'd need to make a Google+ profile, but I will read comments (typically within 24 hours, assuming I get an email notification) and simply edit the description to include a link. SOURCE CODE Update June 2018: Wow, I had no idea there were comments on this video at all. Everyone has been asking for years! Sorry! http://lucb1e.com/rp/php/horrible-encryption-square.php I have to warn you, it's not super easy to use. You need to have PHP installed on the command line (Ubuntu/Debian/Mint: apt install php-cli) and run it as shown in the video. To change whether it does substitution, see the third line of the file.
Views: 4300 lucb1e
Because "use urandom" isn't everything: a deep dive into CSPRNGs in Operating Systems & Programming
Implementation, hazards and updates on use of RNGs in programming languages and the Linux Kernel (among others) Over the past year multiple people have been engaging language maintainers and designers to change their use of CSPRNGs (mainly relying on user-land RNGs like the one from OpenSSL, and sometimes suggesting "adding entropy" by various means from user-land daemons like haveged). In this short presentation we'll survey the struggle of cryptographers, developers and security engineers to change the path various high-profile languages have taken to provide randomness to their userbase. Affected languages include but are not limited to: Ruby, node.js and Erlang. We outline better approaches for language maintainers and implementers as well as coming changes within the Linux kernel crypto subsystem (i.e. /dev/random and /dev/urandom) w.r.t. security and performance. Recently these changes were merged into mainline Linux (4), problems with languages implementations however remain. We'll also discuss operating system provided randomness testing, attacks/mitigation in embedded and virtualized environments. #Software #Security Aaron Zauner (azet)
Views: 222 SHA2017
How to Salt & Hash a Password Using PHP and MySQL - Create a Login Pt 3
In this video I will discuss and illustrate password storage with salting and hashing using PHP and MySQL. I will use a simple salt and hash with SHA-512 and discuss some security issues. In production, you should strongly consider unique or random salt of your passwords. In the next video, I will discuss the login process.
Views: 16197 Ken Swartwout
How to encrypt password using password_hash function in php
New password encryption technique in php using password_hash function.
Views: 500 Arindam Roy
Random vs SecureRandom a resetowania hasła w Javie
Generowanie wartości losowych w komputerze nie jest tak proste jak rzut kostką w rzeczywistości. Dlaczego więc nie warto używać klasy `Random` w Javie? Klasa random jest generatorem liczb pseudolosowych. Oznacza to, że na podstawie niewielkiej ilości informacji - tak zwanego ziarna generuje ona deterministycznie kolejne liczby pseudolosowe. Przy użyciu odpowiedniego kodu można odgadnąć ziarno i odtworzyć kolejne ciągi generowane przez tą funkcję. Icon made by Freepik from www.flaticon.com #od0dopentestera #java #programowanie
Views: 492 Kacper Szurek
Fun with RNG - don't trust pseudo-random number generators
They're simply not random.
Views: 247 Zaxik
Importance Of Developers Salting User Passwords
Racker Bret McGowen discusses the importance of developers salting their user's passwords to help increase security for their app.
Views: 34387 Rackspace
Generate Crypto material for Hyperledger Fabric
Use Hyperledger Fabric CA to generate your crypto material V1.1 preview. Thanks Keith!
Views: 1802 Hyperledger Fabric
Generate Random Values - SQL in Sixty Seconds #042
Though it looks simple it is very difficult to generate random numbers which one can't guess. In this sixty second video we will see a neat trick where we will generate Random value between specified two numbers. Read more here: http://bit.ly/12oAiIj
Views: 10874 Pinal Dave
Bcrypt & Password Security - An Introduction
A conceptual introduction to bcrypt and why it's useful in the context of user password security. MakerSquare | http://mks.io/learntocode MakerSquare is a three-month full-time career accelerator for software engineering. By teaching computer science fundamentals and modern web languages like JavaScript, we prepare students to join top flight engineering teams.
Views: 24898 Hack Reactor
Adding Randomness to Password Based Authentication Schemes using Random Challenge
User Authentication Adding Randomness to Password Based Authentication Schemes using Random Challenge Keywords: User Authentication Adding Randomness to Passwords Random Challenge Network Security Notes Computer Network Security Notes
Web based private key authentication in php
A web based method to register and authenticate user using public/private keys. Technical details http://stackoverflow.com/a/25229985/1794248 Source code https://github.com/moldcraft/doer
Views: 2587 Experimental
Encryption of Confidential Numbers in Excel
Encryption can hide personal information such as credit card numbers and social security numbers for prying eyes. We use a simple algorithm here, so if you use this encryption for criminal purposes, law enforcement can crack the code.
Views: 10624 Dr. Gerard Verschuuren
Python for Network automation with GNS3(Part-6) Opening and Writing file with python script
Learn Python programming. In this series of videos I will show you how you can quickly and easily program Cisco networks using Python. More free Python videos here: https://www.youtube.com/channel/UCE5lO-r02VMgP5RsVIkc_Gw Learn how to automate your networks using Python. Python file should be in .py format, you can create python script in simple Notepad or Notepad++ and save that file with .py extension.
Views: 2669 Ashish Gupta
Improved secure data transmission using pixel mapping algorithm in video steganography
B.E ECE Final Year Project done by C.Manishankar, A.Vinoth, P.Elangovan, M.Logeshwaran In the proposed work for each frame two pixels situated at the top left and the bottom right corner are modified so as to insert text in each image. After the completion of the pixel value changing all the images is placed in a sequential manner and then all the frames are cascaded for generation of the original video file with encryption. This output Stego video is almost similar to the original video file with no changes.
Views: 988 Mani Shankar
Pseudorandom Knapsacks and the Sample Complexity of LWE Search-to-Decision Reductions
Talk at crypto 2011. Authors: Daniele Micciancio, Petros Mol. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=23590
Views: 247 TheIACR
Password Best Practices
http://CustomSoftwareAdvisor.com/ Transcript below ... Storing passwords in a secure manner is extremely important. This video is a brief overview for the executive, project manager, or IT manager, of current best practices for secure password storage. -- Transcript -- 00:19 you may believe user credentials are stored in the database in clear text (http://bit.ly/lPqS3C), but this is a very naive way to store passwords. And for my career, it has been considered a very poor practice. 01:12 the problem is that if anybody hacks your database, they can easily log in as any user and do anything in the name of that user. 01:28 Even if your application doesn't allow users to do anything 'destructive', it can still serve as an embarrassment to the application and your company. 01:43 if you ever see user credentials stored in clear text format, you need to have a serious discussion with your programmer, about storing them in a secure manner. 02:00 Part of the solution is to mask the password. So instead of storing it in clear text, you would instead store the 'hash'. 02:16 what is a hash? A hash is the result of a computational algorithm (http://bit.ly/l5fdWa), where you pass in a password, and it returns a series of alpha numeric characters. 02:35 a hash cannot be reverse engineered to get the original input (i.e. the password). 02:44 a hash is a one way algorithm. In other words, you cannot take the result of a hashing algorithm and reverse it to get the original password; a hash result is similar to a scrambled egg, in that it can never be unscrambled. 03:05 However, the hashing algorithm is consistent, so hashing our password 'abc123', you get the same hash value every time. 03:21 don't create your own hashing algorithm, there are many included in most standard programming libraries. There are even hashing generators online (http://bit.ly/kFeGEM, http://bit.ly/jfpWRO, etc..). Notice when you enter my example password 'abc123' is hashed to '6367c48dd193d56ea7b0baad25b19455e529f5ee'. Notice also that both generators hash to the same values, proving the algorithms consistency. 04:08 however hashing isn't enough. You can't just store the password hash to be secure. 04:20 you can't just store the passwords hash, because hackers have databases called 'Rainbow Tables' (http://bit.ly/kXEnZV) where they can compare your hashed password and get the users password almost instantly. 05:25 [I stutter and did not edit so people would see how I really speak] 05:34 we can get around this problem by salting the password and hash the salted password. 05:49 what is a salt? A salt is a series of random alpha-numeric characters which are prepended (or appended) to the clear text password. Then the combination of salt + password is hashed. 06:16 Then the salt and hashed, salted, password is stored in the database along with the user name. 06:48 where do you get the salt? Again, there is functionality included in most programming libraries to generate this for you easily. 07:25 so how does this all tie together? When a user creates a new account, entering their user name and password (in clear test), then hits the submit button, we generate a salt, prepend/append the salt to the user entered clear text password, creating a 'salted password', then hash the salted password. Then the user name, salt, and the hash of the salted password, are all stored in the database. 08:11 When the user logs in, we retrieve the user credentials (salt and password hash) from the database based on their entered user name. Then we salt the user entered clear text password, using the salt from the database, and generate the hash on that salted password. We then compare the calculated hash against the hash stored in the database, and we know if the password is correct if the hash values match. If they don't match, then the password was incorrect. 09:08 in a nutshell, if you open your database and are able to read a user's password, then you need to get that fixed. It's a simple procedure, most programmers know how to do this, and there is plenty of documentation outlining how to secure your passwords. Please comment below or email me directly if you have any questions, comments, or concerns. http://CustomSoftwareAdvisor.com/Contact/
Views: 2651 John MacIntyre
Generate Secure Password with MD5 and SHA1 in Java
In this video, I will demo how to Generate Secure Password with MD5 and SHA1 in Java You can see programming languages book reviews and buy Books Online at http://learningprogramming.net/ You also can buy my apps in http://codecanyon.net/user/octopuscodes/portfolio
Views: 11983 Learning Programming
Tightly Secure Signatures and Public-Key Encryption
Talk at crypto 2012. Authors: Dennis Hofheinz, Tibor Jager. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=24312
Views: 285 TheIACR
Abusing weak PRNGs in PHP applications
Abusing Mersenne Twister (mt_rand()) in PHP. A PoC exploit resets the admin password on a PunBB forum provided that there is a PHP-Nuke installation on the same server and it supports Keep-Alive requests. A rainbow table is used for faster seed cracking.
Views: 1589 gat3way
PHP md5 function - Calculate the md5 hash of a string
Calculate the md5 hash of a string and print hash on the screen. Watch the full series at https://www.youtube.com/playlist?list=PLDc4HLZ-76N6UUnvPDrRHberKaBg_3DSN
Views: 118 Shai Gerbi
Device Independence: A New Paradigm for Randomness Manipulation? - Thomas Vidick
Thomas Vidick Massachusetts Institute of Technology April 1, 2013 A trusted source of independent and uniform random bits is a basic resource in many computational tasks, such as cryptography, game theoretic protocols, algorithms and physical simulations. Implementing such a source presents an immediate challenge: how can one certify whether one has succeeded? i.e. suppose someone were to claim that a particular device outputs a uniformly random n-bit string; is there a feasible test to verify that claim? This seems like an impossible task: since the device must output each n-bit string with equal probability there is no basis on which to reject any particular output in favor of any other. Ideas originating in the study of nonlocality in quantum mechanics suggest a remarkable solution to this conundrum: a random number generator whose output is certifiably random in the sense that if the output passes a simple statistical test, and a no-signaling condition is met between the two boxes in the randomness generating device, then even a quantum skeptic (viz Einstein's famous quote ``God does not play dice with the Universe''), would be convinced that the output is truly random. Partially dropping the skeptic's hat, I will show how the same ideas can be used to obtain a protocol for key distribution whose security, although it relies on the correctness of quantum mechanics, does not require any assumption on the nature of the quantum mechanical devices used in the protocol. In particular, security of the generated key is guaranteed even if the devices are faulty or even have been handed over to the users by a malicious, computationally unbounded, adversary. These results suggest a powerful paradigm of "device independence" enabling previously impossible tasks under minimal assumptions. Based on joint work with Umesh Vazirani. For more videos, visit http://video.ias.edu
Basic PHP Programming Tutorial 22: Hashing part 2: salting
Link to the full playlist: http://www.youtube.com/playlist?list=PLQVvvaa0QuDcYpcjrNB43_iKqla5UeQw_ Sentdex.com Facebook.com/sentdex Twitter.com/sentdex How to further protect hashed data
Views: 467 sentdex
Applied Cryptography: DES in Java - Part 1
Previous video: https://youtu.be/YERCLbyoizY Next video: https://youtu.be/K__Y0BK6GFM
Views: 2310 Leandro Junes
12.How to generate an OTP using java
-----------------------------------Tools Used-------------------------------------------------- 1.jdk 2.Eclipse ---------------------------------Study Material----------------------------------------------- 1.Java Math Class https://www.tutorialspoint.com/java/lang/java_lang_math.htm ---------------------------------Subscribe To My Channel----------------------------- https://www.youtube.com/channel/UCcoSNcVQbmV2hhIh7nVt5HQ Thanks for watching.................!!!!!!
Views: 156 Techno Kid
Password generator program in c
In these program if you can give length to program it should generate a password for you but length should be greater than 5
Views: 87 CODE RUSH
TISHITU #12 Tutorial Visual Basic 6.0 how to Load Picture and Randomize function Work
Tishitu explains Randomize uses Number to initialize the Rnd function's random-number generator, giving it a new seed value. If you omit Number, the value returned by the system timer is used as the new seed value. Because the Random statement and the Rnd function start with a seed value and generate numbers that fall within a finite range, the results may be predictable by someone who knows the algorithm used to generate them. Consequently, the Random statement and the Rnd function should not be used to generate random numbers for use in cryptography The Image Control You've already seen in the previous topic that with an Image control, you can set it's Picture property at design time by going to Picture property, clicking the ellipsis (…), and selecting a file from the Load Picture dialog box. Recall that the main types of files that can be assigned to an Image control are .bmp, .jpg, .ico, and .wmf. The Image control has a Stretch property, which is set to False by default. When the Stretch property is False, the Image control will automatically resize itself to expand or contract to the size of the picture that is assigned to it. If instead you want the image to fill the specific size that you make the Image control, set the the Stretch property to True, which will cause the picture you assign to the Image control to automatically expand or contract to conform to the size of the control. Depending on the type of image, the image may or may not appear distorted when stretched â€" this is something you need to experiment with. You can also set the Picture property of an image control in code by using the LoadPicture function, which loads a picture from a file into the control at run-time. The LoadPicture function takes a file name as an argument. Sample syntax is: imgMyPic.Picture = LoadPicture("C:\SomeDirectory\SomeSubDir\MyPic.bmp") TISHITU ISO: 9001-2008 RESEARCH AND CONSULTANCY CELL OF INDUSTRIAL APPLICATION A Joint Accreditation System of Australia and New Zealand Copyright © All Rights Reserved www.tishitu.org Reg No.08122629691/SSI Accreditation No. M3111204IN -~-~~-~~~-~~-~- Please watch: "Lifi Communication by Arduino UNO Download Project" https://www.youtube.com/watch?v=c4gC8dbaiZg -~-~~-~~~-~~-~-
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I Forgot Your Password: Randomness Attacks Against PHP Applications
This video is part of the Infosec Video Collection at SecurityTube.net: http://www.securitytube.net I Forgot Your Password: Randomness Attacks Against PHP Applications Slide : - https://www.usenix.org/system/files/conference/usenixsecurity12/sec12-final218.pdf We provide a number of practical techniques and algorithms for exploiting randomness vulnerabilities in PHP applications.We focus on the predictability of password reset tokens and demonstrate how an attacker can take over user accounts in a web application via predicting or algorithmically derandomizing the PHP core randomness generators. While our techniques are designed for the PHP language, the principles behind our techniques and our algorithms are independent of PHP and can readily apply to any system that utilizes weak randomness generators or low entropy sources. Our results include: algorithms that reduce the entropy of time variables, identifying and exploiting vulnerabilities of the PHP system that enable the recovery or reconstruction of PRNG seeds, an experimental analysis of the Hstad-Shamir framework for breaking truncated linear variables, an optimized online Gaussian solver for large sparse linear systems, and an algorithm for recovering the state of the Mersenne twister generator from any level of truncation. We demonstrate the gravity of our attacks via a number of case studies. Specifically, we show that a number of current widely used web applications can be broken using our techniques including Mediawiki, Joomla, Gallery, osCommerce and others.
Views: 1515 SecurityTubeCons

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