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Winter School on Cryptography Symmetric Encryption: Record layer security - Kenny Paterson
 
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Record layer security notions and results, a lecture by Kenny Paterson. The topic of the 4th Annual Bar-Ilan Winter School on Cryptography held in January 2014, was Symmetric Encryption in Theory and in Practice. The winter school studied symmetric encryption in theory and in practice, and included a study of the theoretical foundations of symmetric encryption on the one hand, and practical constructions and cryptanalysis on the other hand. As every year, the event organizers were Prof. Yehuda Lindell and Prof. Benny Pinkas, of BIU's Department of Computer Science. This year,the Winter School featured speakers from such institutions as the Royal Holloway at the University of London , and the University of Wisconsin - Madison. For all videos of this playlist: https://www.youtube.com/playlist?list=PLXF_IJaFk-9BmvxWhnxPId32CPJhVtU6D 4th Annual Bar-Ilan Winter School on Cryptography: http://crypto.biu.ac.il/winterschool2014/ Prof. Lindell's Lab http://www1.biu.ac.il/indexE.php?id=8043&pt=30&pid=7711&level=2&cPath=7702,7711,8043 Prof. Pinkas' Lab http://www1.biu.ac.il/indexE.php?id=8046&pt=30&cPath=7702,7711,8046 Dept. of Computer Science: http://cs.biu.ac.il/en/ Bar-Ilan University: http://www1.biu.ac.il/en
Views: 254 barilanuniversity
Grade School Crypto
 
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A simple 10-minute introduction to ciphers and cryptographic fundamentals. Topics include Caesar ciphers, algorithms and keys, cipher disks, and modular arithmetic. The video ends with an example of code cracking with frequency analysis.
Views: 1403 cryptosmith
WWII Codebreaking and the First Computers, Malcolm A.H. MacCallum
 
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COPERNICUS FESTIVAL, May 6-11, 2014, Kraków http://www.copernicusfestival.com This is the story of why and how the first computers came into being. They were built to assist British codebreaking during World War II, specifically to make possible automated codebreaking of the German teleprinter codes which the British called "Tunny". The story of Tunny is much less well-known than that of the Enigma machines. The General report on "Tunny" was published only in 2000 and some parts of the Tunny story are still classified. It has less Polish connection than Enigma, where three Polish mathematicians played a crucial role by breaking a pre-war version of the Enigma machine: Marian Rejewski, Henryk Zygalski and Jerzy Jerzy Różycki. Like Enigma (where the UK built on the Polish work), the Tunny codes were broken by mathematicians at Bletchley Park, the wartime home of the UK's "Government Code and Cipher School". During the war Bletchley Park was called "Government Communications Headquarters" (GCHQ), so as to give only a vague idea of its purpose. After the war, that became the official name of the UK Government's signals intelligence agency. Because the messages were of high strategic value, the breaking of Tunny was very successful although it decrypted many fewer messages than from Enigma. (27631 Tunny messages were intercepted and 13508 were broken.) As examples, Bletchley decrypted messages direct from Hitler himself in 1944, allowed the British to forewarn the Russians of the German attack around Kursk in July 1943, gave the Allies the German dispositions before D-Day, and showed them the value of the rather slow Italian campaign in tying down German forces. Colossus - machine used for breaking Tunny code - deserves to be called the first computer, although it was not a general purpose computer, but a special purpose cryptographic device. So one has to choose qualifying adjectives a bit carefully. (Many histories say the American ENIAC was the first computer. This just reflects the British ability to keep a secret). Not all features of later machines were present in Colossus: for example it did not have electronically stored programs. But many were: for example, Tommy Flowers introduced the term Arithmetic-Logic Unit (ALU) for the core processing parts and Jack Good's experience with it led him to develop the idea of microprogramming. There is also an interesting comparison of Colossus with the first generation IBM PC. Its first break of a message was on 5 February 1944. By the end of the war there were 10 Colossi. At the end of the war Churchill ordered the destruction of the Colossi. All but two Colossi were broken up and designs destroyed. The remaining two are alleged to have been kept in case the Russians started to use captured German Tunny machines: those Colossi were destroyed around 1960. Information about the machines' existence only emerged in the 1970s due to Brian Randell in particular. Photos were released in 1975, and Flowers was allowed to publish the hardware design of the first Colossus in 1983 (without the explanation of what it was used for). In 1996 the US published the information it had about the machines and, due to Donald Michie, the "General report on Tunny" was published in June 2000. The general report on the Testery's work is still classified. There is a working reconstructed Colossus at Bletchley Park, built by Tony Sale and a team of volunteers. *** Professor Malcolm AH MacCallum is a British cosmologist , astrophysicist and applied mathematician - an Emeritus Professor of Applied Mathematics at the Queen Mary University of London, Deputy President of the International Society on General Relativity and Gravitation, member of the London Mathematical Society, and a chairman of the advisory Board of Mathematics Department at University of York. His field of interests covers most aspects of classical non-Newtonian gravity theory as well as computer algebra applied to differential equations.
Secure Identity-Based Encryption in the Quantum Random O ...
 
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Talk at crypto 2012. Author: Mark Zhandry. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=24298
Views: 448 TheIACR
Position-Based Quantum Cryptography: Impossibility and Constructions
 
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Talk at crypto 2011. Authors: Serge Fehr, Rafail Ostrovsky, Vipul Goyal, Christian Schaffner, Nishanth Chandran, Ran Gelles, Harry Buhrman. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=23588
Views: 639 TheIACR
Functional Encryption for Regular Languages
 
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Talk at crypto 2012. Author: Brent Waters. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=24299
Views: 1097 TheIACR
Cryptanalysis Of The Enigma Machine. Robert Weiss & Ben Gatti at 44CON 2012
 
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Robert Weiss & Ben Gatti present the Cryptanalysis Of The Enigma Machine at 44CON 2012 in London.
On the cryptographic hardness of finding a Nash equilibrium - Nir Bitansky
 
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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
The Math Behind Bitcoin
 
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Elliptic curves, SHA256, and RIPEMD160, oh my. Dr. Darren Tapp presents the fundamental mathematics needed for Bitcoin to work as intended, prepared so that people of many levels can get something out of it. He believes cryptographic methods are not fully used by the private sector. Take some time to learn a little about cryptography and its application to Bitcoin. 3/15/2014 http://www.darrentapp.com/
Leakage-Resilient Zero Knowledge (Crypto 2011)
 
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Sanjam Garg, Abhishek Jain, and Amit Sahai UCLA Abstract. In this paper, we initiate a study of zero knowledge proof systems in the presence of side-channel attacks. Specifically, we consider a setting where a cheating verifier is allowed to obtain arbitrary bounded leakage on the entire state (including the witness and the random coins) of the prover during the entire protocol execution. We formalize a meaningful definition of leakage-resilient zero knowledge (LR-ZK) proof system, that intuitively guarantees that the protocol does not yield anything beyond the validity of the statement and the leakage obtained by the verifier. We give a construction of LR-ZK interactive proof system based on standard general assumptions. To the best of our knowledge, this is the first instance of a cryptographic interactive protocol where the adversary is allowed to perform leakage attacks during the protocol execution on the entire state of honest party (in contrast, prior work only considered leakage prior to the protocol execution, or very limited leakage during the protocol execution). Next, we give an LR-NIZK proof system based on standard number-theoretic assumptions. Finally, we demonstrate the usefulness of our notions by giving two concrete applications: We initiate a new line of research to relax the assumption on the "tamper-proofness" of hardware tokens used in the design of various cryptographic protocols. In particular, we give a construction of a universally composable multiparty computation protocol in the leaky token model (where an adversary in possession of a token is allowed to obtain arbitrary bounded leakage on the entire state of the token) based on standard general assumptions. Next, we give simple, generic constructions of fully leakage-resilient signatures in the bounded leakage model as well as the continual leakage model. Unlike the recent constructions of such schemes, we also obtain security in the "noisy leakage" model.
Views: 792 TheIACR
An Introduction to Elliptic Curve Cryptography
 
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Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 29509 nptelhrd
Cryptography, From Enigma to Elliptical Curve Cryptography
 
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http://uclouvain.acm-sc.be/ Conférence donné le 15 octobre 2012 par Donald Costello pour l'UCLouvain ACM Student Chapter.
Views: 929 Antoine Cailliau
2007-09-05 CERIAS - Applying Recreational Mathematics to Secure Multiparty Computation
 
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Recorded: 09/05/2007 CERIAS Security Seminar at Purdue University Applying Recreational Mathematics to Secure Multiparty Computation Yvo Desmedt, University College, London The problem of a mice traveling through a maze is well known. The maze can be represented using a planar graph. We present a variant of the maze. We consider a grid vertex colored planar graph in which an adversary can choose up to t colors and remove all vertices that have these colors and their adjacent edges. We call the grid in which these vertices and adjacent edges are removed a reduced grid. The problem is that a mice must be able to move in the reduced grid from the first row to the last row, and from the first column to the last column, and this for all possible reductions. We present three types of solutions to construct such grids. The efficiency of these solutions is discussed.The problem finds its origin in the problem of secure multipartycomputation. Imagine going to a medical doctor in Iraq who needs to prescribe some medication, which might be counterindicated. The typical solution is to disclose all medical records to the doctor. If secure multiparty computation would be used, the medical doctor in Iraq only learns from the distributedmedical databases whether the medication is, or is not, counterindicated. We consider the problem of parties each having a secret belonging to a non-abelian group. The parties want to compute the product of these secrets without leaking anything that does not follow trivially from the product. Oursolution is black box, i.e., independent of the non-abelian group. This has applications to threshold block ciphers and post-quantum cryptography. Yvo Desmedt received his Ph.D. (Summa cum Laude) from the University of Leuven, Belgium (1984). He is presently the BT Chair of Information Security at University College London, UK. He is also a courtesy professor at Florida State University. His interests include cryptography, network security and computer security. He was program chair of ICITS 2007, co-program chair of CANS 2005, program chair of PKC 2003, the 2002 ACM Workshop on Scientific Aspects of Cyber Terrorism and Crypto '94. He is editor-in-chief of the IEE Proceedings of Information Security, editor of the Journal of Computer Security, of Information Processing Letters and of Advances in Mathematics of Communications. He has given invited lectures at several conferences and workshop in 5 different continents. He has authored over 150 refereed papers, of which 114 listed on DBLP. (Visit: www.cerias.purude.edu)
Views: 190 ceriaspurdue
Verifying computations with state
 
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When a client outsources a job to a third party (e.g., the cloud), how can the client check the result, without re-executing the computation? Recent work in proof-based verifiable computation has made significant progress on this problem by incorporating deep results from complexity theory and cryptography into built systems. However, these systems work within a stateless model: they exclude computations that interact with RAM or a disk, or for which the client does not have the full input. This paper describes Pantry, a built system that overcomes these limitations. Pantry composes proof-based verifiable computation with untrusted storage: the client expresses its computation in terms of digests that attest to state, and verifiably outsources that computation. Using Pantry, we extend verifiability to MapReduce jobs, simple database queries, and interactions with private state. Thus, Pantry takes another step toward practical proof-based verifiable computation for realistic applications. In the ACM Digital Library: http://dl.acm.org/citation.cfm?id=2522733
The World's Greatest Unsolved Ciphers, part 1 - Prof Craig Bauer
 
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Speaker: Prof. Craig Bauer (York College, PA) Title: The World's Greatest Unsolved Ciphers Date: Wednesday, 24-Apr-2013 This is part 1. Abstract: Ciphers that have never been solved from recent times going back hundreds of years, will be detailed. The list includes many lesser-known ciphers that you likely have never seen before. Should be interesting to students and faculty, from math or history or computer science. About the Speaker: Craig Bauer is a cryptography expert who is managing editor of Cryptologia and teaches mathematics at York University in York, PA. His website is http://faculty.ycp.edu/∼cbauer/. He has a book on this subject: "Unsolved! The History and Mystery of the World's Greatest Ciphers from Ancient Egypt to Online Secret Societies", Princeton University Press. Video and editing by me. His slides are posted to http://wdjoyner.org/video/bauer/, by permission of Prof Bauer.
Views: 9959 usnamathweb
New Developments in Cryptocurrencies and Blockchain Technologies
 
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Virtual currency has the potential to revolutionize the way we make payments, but using these digital assets requires special data protection. Join Professor Dan Boneh as he discusses new developments in cryptocurrency and computer security and analyzes new systems that strengthen blockchain capabilities. Hear more from Dan Boneh in our online cyber security programs: https://stanford.io/2nD5rXR
Views: 1132 stanfordonline
Crypto 2011 introductory remarks
 
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Introductory remarks at Crypto 2011. Tom Shrimpton, General Chair. University of California Santa Barbara, August 15, 2011.
Views: 94 TheIACR
Crypton - a Zero Knowledge application framework
 
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https://crypton.io/ Crypton is a framework for building cryptographically secure cloud applications.
Views: 684 Cam Pedersen
[VIASM] Can Mathematics Provide Good Models to Society? - Prof. Koblitz P.1
 
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Time: Thursday, December 13, 2012 15.00 -- 17.00. Location: VIASM Lecture Hall (C02). Speaker: Prof. N. Koblitz (University of Washington). Language: English. Abstract: As mathematics becomes used more widely to analyze data and to model both social and scientific problems, it becomes important to critically analyze such uses of mathematics. Sometimes the most valuable service that a mathematician can perform is to educate the public about the limitations of mathematical modeling and data analysis about what mathematics cannot do. I will give some examples from my own experience, and will describe the failure of a mathematical model of a "provably secure digital signature". I will also describe a very different sense in which models of mathematical thinking can be extremely valuable to society. This is a sense that comes from theoretical as well as applied mathematics and has more to do with a culture of rigorous thought and freedom from bias than with any direct use of mathematics to model the important unsolved problems that society is faced with.
Example of Zero-Knowledge Proof
 
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Just something for class
Views: 7418 Ben Quesada
Gravity Falls: Season 3 - Made by Fans
 
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A group of fans is making a Season 3 of Gravity Falls.... Watch the mini episode they made: https://www.youtube.com/watch?v=ZYhXqKo5-6k The original video was set to private shortly after I made this video. That's why the above link is different than the original. **Please THUMBS UP the video if you enjoyed** ●●●JOIN THE DECODERS: http://bit.ly/18ZdpzY●●● My 2nd Channel: https://www.youtube.com/channel/UCpxHMMKymSc3OSjQ379Cqbw/ My Twitter: https://twitter.com/Vailskibum94 My Facebook: https://www.facebook.com/vailskibumgf My Steam Group: http://steamcommunity.com/groups/vailskibum94 My videos are produced with the editor Camtasia Studio 2018 and I use a Blue Yeti Microphone to record. All scripts are written by me. Any footage used is from various TV shows, movies, and games to illustrate my personal thoughts on these pieces of media. All stock photos and images are either created by me or are sourced from publicly viewable image websites. This critcism, comment, or news reporting falls under Fair Use (The Copyright Act of 1976, Section 107). If you are interested in viewing full cartoon episodes/movies or playing entire video games, please buy the DVDs and games from the media companies providing them.
Views: 907273 Vailskibum94
DJ Logilo - Do You Feel - URBAN BACKING BEATS
 
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URBAN BACKING BEATS: Urban Backing Beats is the channel for all you urban instrumentas needs. Use our backing tracks to practice your rap flows and hone your mic skills. Urban Backing Beats est la chaîne dédiée à tous les mcs. Trouve les instrus de tes rappeurs préférés, découvre des nouveaux sons, les prods des meilleurs DJ et travaille ton flow, http://www.youtube.com/urbanbackingbeats
Views: 733 UrbanBackingBeats

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