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On the cryptographic hardness of finding a Nash equilibrium - Nir Bitansky
 
01:03:50
The computational complexity of finding Nash Equilibria in games has received much attention over the past two decades due to its theoretical and philosophical significance. This talk will be centered around the connection between this problem and cryptography. Mostly, I will discuss a result proving that finding Nash equilibrium is hard, assuming the existence of a cryptographic notion called indistinguishability obfuscation. This is done by demonstrating that this cryptographic notion gives rise to a hard computational problem in the complexity class PPAD, for which finding Nash equilibrium is known to be complete. Indeed, in recent years indistinguishability obfuscation has turned out to have surprisingly strong implications in cryptography and beyond. I will give the high-level picture as to where we stand in our efforts of constructing such obfuscators and basing them on solid hardness assumptions. In a companion talk on Tuesday, I will discuss one specific line of work that reduces indistinguishability obfuscation to simple assumptions on 5-linear maps, coming closer to well-studied cryptographic objects such as bilinear-map groups. The talk is based on joint work with Paneth and Rosen. No prior knowledge in cryptography is required. More videos on http://video.ias.edu
DEF CON 22 - Kenneth White and Matthew Green - The Open Crypto Audit Project
 
51:16
Slides here: https://defcon.org/images/defcon-22/dc-22-presentations/White-Green/DEFCON-22-Kenneth-White-and-Matthew-Green-The-Open-Crypto-Audit-Project-Updated.pdf The Open Crypto Audit Project Kenneth White CO-FOUNDER, OPEN CRYPTO AUDIT PROJECT Matthew Green RESEARCH PROFESSOR, JOHNS HOPKINS UNIVERSITY Join us for the story of the origins and history of the Open Crypto Audit Project (OCAP). OCAP is a community-driven global initiative which grew out of the first comprehensive public audit and cryptanalysis of the widely used encryption software TrueCrypt®. Our charter is to provide technical assistance to free and open source software projects in the public interest. We serve primarily as a coordinator for volunteers and as a funding mechanism for technical experts in security, software engineering, and cryptography. We conduct analysis and research on FOSS and other widely software, and provide highly specialized technical assistance, analysis and research on free and open source software. This talk will present how we audited TrueCrypt, detailing both the Phase I security assessment, and the Phase II cryptanalysis. Looking forward, in light of GotoFail and HeartBleed, we will discuss future plans for our next audit projects of other open source critical infrastructure. Kenneth White is a co-founder of the CBX Group, and formerly principal scientist and senior security R&D engineer at Social & Scientific Systems. His work focuses on cloud security, machine learning, and distributed database architecture. At SSS, White led the Biomedical Informatics team that designed and runs the operations center for the largest clinical trial network in the world, with research centers in over 100 countries. Together with Matthew Green, White co-founded the TrueCrypt audit project, a community-driven initiative to conduct the first comprehensive cryptanalysis and public security audit of the widely used TrueCrypt encryption software. White holds a MEd from Harvard and is a PhD candidate in neuroscience and cognitive science, with research focusing on expert systems, real-time classification and machine learning. He is a technical reviewer for the Software Engineering Institute, and publishes and speaks frequently on computational neuroscience, signal processing, and security engineering. Twitter: @kennwhite Matthew D. Green, PhD is a professor of computer science at Johns Hopkins University. He teaches applied cryptography and builds secure systems. Green trained under Susan Hohenberger and Avi Rubin, and his research includes techniques for privacy-enhanced information storage, anonymous payment systems, and bilinear map-based cryptography. Green formerly served as a senior research staff member at AT&T Labs. Together with Kenneth White, he co-founded the TrueCrypt audit project, a community-driven initiative to conduct the first comprehensive cryptanalysis and public security audit of the widely used TrueCrypt encryption software. He blogs at Cryptography Engineering, and talks about cryptography and privacy. Twitter: @matthew_d_green Web: https://opencryptoaudit.org/people
Views: 3412 DEFCONConference
Cryptographic Problems in Algebraic Geometry Lecture
 
01:06:16
AGNES is a series of weekend workshops in algebraic geometry. One of our goals is to introduce graduate students to a broad spectrum of current research in algebraic geometry. AGNES is held twice a year at participating universities in the Northeast. Lecture presented by Kristin Lauter.
Views: 1599 Brown University
Characterizing Moebius Transformations with Two Fixed Points
 
01:01:38
An Introduction to Riemann Surfaces and Algebraic Curves: Complex 1-Tori and Elliptic Curves by Dr. T.E. Venkata Balaji, Department of Mathematics, IIT Madras. For more details on NPTEL visit http://www.nptel.iitm.ac.in/syllabus/111106044/ Goals: * To analyze Moebius transformations with more than one fixed point in the extended complex plane * To continue with the classification of Moebius transformations begun in the previous lecture by defining the notions of loxodromic, elliptic and hyperbolic Moebius transformations using the values of the square of the trace of the transformation * To characterize geometrically the loxodromic, elliptic and hyperbolic Moebius transformations by showing that they can be conjugated by suitable Moebius transformations to multiplication by a complex number * To show that the elliptic Moebius transformations are precisely those that are conjugate to a rotation about the origin * To show that the hyperbolic Moebius transformations are precisely those that are conjugate to a real scaling Keywords: Parabolic, elliptic, hyperbolic and loxodromic Moebius transformations, fixed point of a Moebius transformation, square of the trace of a Moebius transformation, translation, conjugation by a Moebius transformation, special linear group, projective special linear group
Views: 2247 nptelhrd
Using Excel to Create a Correlation Matrix  || Correlation Matrix Excel
 
04:48
http://alphabench.com/data/excel-correlation-matrix-tutorial.html This tutorial demonstrates how to create a correlation matrix in Excel. The example used in the video is for stock price changes over a one year period. The spreadsheet in the is example can be downloaded by visiting: http://www.alphabench.com/resources.html
Views: 51701 Matt Macarty
Outline of formal science | Wikipedia audio article
 
01:34:38
This is an audio version of the Wikipedia Article: https://en.wikipedia.org/wiki/Outline_of_science 00:01:04 1 Essence of science 00:02:18 2 Scientific method 00:07:04 3 Branches of science 00:07:28 3.1 Natural science 00:08:35 3.2 Formal science 00:55:27 3.3 Social science 00:56:37 3.4 Applied science 00:57:07 4 How scientific fields differ 00:58:13 5 Politics of science 00:59:33 6 History of science 01:01:46 6.1 By period 01:04:08 6.1.1 By date 01:05:03 6.2 By field 01:08:58 6.3 By region 01:09:07 6.3.1 History of science in present states, by continent 01:09:25 6.3.2 History of science in historic states 01:09:59 7 Philosophy of science 01:10:20 8 Scientific community 01:10:47 8.1 Scientific organizations 01:11:07 8.2 Scientists 01:11:50 8.2.1 Types of scientist 01:11:59 8.2.1.1 By field 01:28:07 8.2.1.2 By employment status 01:28:56 8.2.2 Famous scientists 01:33:12 9 Science education 01:33:59 10 See also Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago. Learning by listening is a great way to: - increases imagination and understanding - improves your listening skills - improves your own spoken accent - learn while on the move - reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone. Listen on Google Assistant through Extra Audio: https://assistant.google.com/services/invoke/uid/0000001a130b3f91 Other Wikipedia audio articles at: https://www.youtube.com/results?search_query=wikipedia+tts Upload your own Wikipedia articles through: https://github.com/nodef/wikipedia-tts Speaking Rate: 0.7254187033487707 Voice name: en-US-Wavenet-F "I cannot teach anybody anything, I can only make them think." - Socrates SUMMARY ======= The following outline is provided as a topical overview of science: Science – the systematic effort of acquiring knowledge—through observation and experimentation coupled with logic and reasoning to find out what can be proved or not proved—and the knowledge thus acquired. The word "science" comes from the Latin word "scientia" meaning knowledge. A practitioner of science is called a "scientist". Modern science respects objective logical reasoning, and follows a set of core procedures or rules in order to determine the nature and underlying natural laws of the universe and everything in it. Some scientists do not know of the rules themselves, but follow them through research policies. These procedures are known as the scientific method.
Views: 6 wikipedia tts
Outline of science | Wikipedia audio article
 
01:10:05
This is an audio version of the Wikipedia Article: https://en.wikipedia.org/wiki/Outline_of_science 00:00:47 1 Essence of science 00:01:43 2 Scientific method 00:05:13 3 Branches of science 00:05:32 3.1 Natural science 00:06:22 3.2 Formal science 00:40:51 3.3 Social science 00:41:44 3.4 Applied science 00:42:08 4 How scientific fields differ 00:42:58 5 Politics of science 00:43:59 6 History of science 00:45:37 6.1 By period 00:47:24 6.1.1 By date 00:48:06 6.2 By field 00:50:59 6.3 By region 00:51:07 6.3.1 History of science in present states, by continent 00:51:22 6.3.2 History of science in historic states 00:51:48 7 Philosophy of science 00:52:05 8 Scientific community 00:52:27 8.1 Scientific organizations 00:52:44 8.2 Scientists 00:53:17 8.2.1 Types of scientist 00:53:25 8.2.1.1 By field 01:05:11 8.2.1.2 By employment status 01:05:48 8.2.2 Famous scientists 01:08:58 9 Science education 01:09:34 10 See also Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago. Learning by listening is a great way to: - increases imagination and understanding - improves your listening skills - improves your own spoken accent - learn while on the move - reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone. Listen on Google Assistant through Extra Audio: https://assistant.google.com/services/invoke/uid/0000001a130b3f91 Other Wikipedia audio articles at: https://www.youtube.com/results?search_query=wikipedia+tts Upload your own Wikipedia articles through: https://github.com/nodef/wikipedia-tts "There is only one good, knowledge, and one evil, ignorance." - Socrates SUMMARY ======= The following outline is provided as a topical overview of science: Science – the systematic effort of acquiring knowledge—through observation and experimentation coupled with logic and reasoning to find out what can be proved or not proved—and the knowledge thus acquired. The word "science" comes from the Latin word "scientia" meaning knowledge. A practitioner of science is called a "scientist". Modern science respects objective logical reasoning, and follows a set of core procedures or rules in order to determine the nature and underlying natural laws of the universe and everything in it. Some scientists do not know of the rules themselves, but follow them through research policies. These procedures are known as the scientific method.
Views: 1 wikipedia tts

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