Session W3: Attacks on Elliptic curve and pairing cryptosystems
Session chair: Imbert Laurent
Talk: Breaking pairing-based cryptosystems using ηT pairing over GF(3^97)
Speaker: Takuya Hayashi

Views: 231
ECC2012staff

Pairing based cryptography has resulted in a number of breakthrough results, including some major developments in the area of zero knowledge proof systems. A zero knowledge proof system allows a party to prove that a statement is true without revealing any other information. Zero knowledge proofs are used in everything from identification protocols (allowing a party to prove that he is who he claims to be) and encryption schemes with stronger security properties, to securing protocols against malicious adversaries, and constructing privacy preserving systems. It has been shown that zero knowledge proofs can be constructed from a variety of number theoretic assumptions (or, more generally from any trapdoor permutation); however most of these constructions are complex and inefficient. In '06 Groth, Ostrovsky, an Sahai showed how to construct proof systems based on pairings which have much more structure than traditional constructions; this structure in turn has since been shown to result in proof systems with greater efficiency, stronger security, and more functionality. This talk will describe at a high level how pairings allows us to construct zero knowledge proofs with more structure than traditional tools, and then discuss some of the applications that take advantage of this structure, focusing on applications to privacy and anonymity.

Views: 1103
Microsoft Research

The 3rd Bar-Ilan Winter School on Cryptography: Bilinear Pairings in Cryptography, which was held between February 4th - 7th, 2013.
The event's program: http://crypto.biu.ac.il/winterschool2013/schedule2013.pdf
For All 2013 Winter school Lectures: http://www.youtube.com/playlist?list=PLXF_IJaFk-9C4p3b2tK7H9a9axOm3EtjA&feature=mh_lolz
Dept. of Computer Science: http://www.cs.biu.ac.il/
Bar-Ilan University: http://www1.biu.ac.il/indexE.php

Views: 7886
barilanuniversity

John Wagnon discusses the basics and benefits of Elliptic Curve Cryptography (ECC) in this episode of Lightboard Lessons.
Check out this article on DevCentral that explains ECC encryption in more detail: https://devcentral.f5.com/articles/real-cryptography-has-curves-making-the-case-for-ecc-20832

Views: 163463
F5 DevCentral

The 3rd Bar-Ilan Winter School on Cryptography: Bilinear Pairings in Cryptography, which was held between February 4th - 7th, 2013.
The event's program: http://crypto.biu.ac.il/winterschool2013/schedule2013.pdf
For All 2013 Winter school Lectures: http://www.youtube.com/playlist?list=PLXF_IJaFk-9C4p3b2tK7H9a9axOm3EtjA&feature=mh_lolz
Dept. of Computer Science: http://www.cs.biu.ac.il/
Bar-Ilan University: http://www1.biu.ac.il/indexE.php

Views: 6024
barilanuniversity

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: 471335
itfreetraining

The 3rd Bar-Ilan Winter School on Cryptography: Bilinear Pairings in Cryptography, which was held between February 4th - 7th, 2013.
The event's program: http://crypto.biu.ac.il/winterschool2013/schedule2013.pdf
For All 2013 Winter school Lectures: http://www.youtube.com/playlist?list=PLXF_IJaFk-9C4p3b2tK7H9a9axOm3EtjA&feature=mh_lolz
Dept. of Computer Science: http://www.cs.biu.ac.il/
Bar-Ilan University: http://www1.biu.ac.il/indexE.php

Views: 2509
barilanuniversity

Session W3: Attacks on Elliptic curve and pairing cryptosystems
Session chair: Imbert Laurent
Talk: On Fault-based Attacks and Countermeasures for Elliptic Curve Cryptosystems
Speaker: Agustín Domínguez-Oviedo

Views: 185
ECC2012staff

Views: 2524
Internetwork Security

Views: 1093
barilanuniversity

Eurocrypt 2016. Jens Groth. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=27580

Views: 288
TheIACR

When using anonymous networks like Tor or I2P, one problem is always how to prevent spam/DoS attacks when you cannot distinguish one entity from another, and hence cannot limit them without either compromising their anonymity by requiring registration of some kind, or requiring captcha-like challenges which are time consuming to implement and usually only a temporary solution at best. Here I introduce a new kind of authentication system based on homomorphic properties of elliptic curve cryptography and zero knowledge proofs called "Linkable Ring Signatures". It allows one to add their public key to a larger group of existing public keys, called a "ring", and sign using the entire "ring" of keys + private key in such a way that no one can tell which private key has signed the message, but can mathematically verify that it was one private key corresponding to one of the public keys in the ring. On top of that, it allows a verifier that only has access to the public keys in the ring to make sure that for any one [message, ring] pair, a private key has only signed it once - duplicate signatures for the same message are detectable. This allows for limiting interactions from any party holding one of these access keys (to say, one message per minute per key), without the party losing any anonymity as their signature is indistinguishable from any other party in the ring. Furthermore, because ring signatures use a cryptographic component called "zero knowledge proofs", signing reveals zero information about the private key - hence no matter how many signatures are generated, it is impossible to use them to try to forge messages or fingerprint/bruteforce the signer key. The proof of this will be shown in the talk. In this talk I will walk through the cryptographic primitives that make this possible, and show a demo service on Tor/I2P that implements this scheme to make an anti-spam anonymous forum.

Views: 814
Security BSides London

Much of the research in number theory, like mathematics as a whole, has been inspired by hard problems which are easy to state. A famous example is 'Fermat's Last Theorem'. Starting in the 1970's number theoretic problems have been suggested as the basis for cryptosystems, such as RSA and Diffie-Hellman. In 1985 Koblitz and Miller independently suggested that the discrete logarithm problem on elliptic curves might be more secure than the 'conventional' discrete logarithm on multiplicative groups of finite fields. Since then it has inspired a great deal of research in number theory and geometry in an attempt to understand its security. I'll give a brief historical tour concerning the elliptic curve discrete logarithm problem, and the closely connected Weil Pairing algorithm.

Views: 1233
Microsoft Research

Optimized Identity Based Encryption from Bilinear Pairing for Lightweight Devices
IEEE PROJECTS 2017-2018
Call Us: +91-7806844441,9994232214
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Website: http://www.ieeeproject.net
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Support Including Packages
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Views: 45
IEEE PROJECTS CHENNAI

At the SIAM Annual Meeting held in Minneapolis in July, Dr. Kristin Lauter of Microsoft Research discussed Elliptic Curve Cryptography as a mainstream primitive for cryptographic protocols and applications. The talk surveyed elliptic curve cryptography and its applications, including applications of pairing-based cryptography which are built with elliptic curves. Lauter also discussed its applications to privacy of electronic medical records, and implications for secure and private cloud storage and cloud computing.

Views: 1850
Society for Industrial and Applied Mathematics

Over the past decade the cryptographic research community has made impressive progress in developing new cryptographic protocols. This work has advanced our understanding of basic technologies such as public key encryption, key agreement, and digital signatures. Moreover, it has given us entirely new paradigms for securing data, such as Attribute Based Encryption, anonymous credentials and techniques for computing on encrypted data. Despite these advances, only a trickle of new cryptographic technology has filtered down to the systems community in the form of useable cryptographic implementations. Even supported prototype research implementations are few and far between. This is a major loss for researchers, to say nothing of industry and the open source community. In this talk we introduce Charm, an extensible Python-based framework for rapidly prototyping cryptographic systems. Charm was designed from the ground up to support the development of advanced cryptographic schemes. It includes support for multiple cryptographic settings, an extensive library of re-usable code, along with the infrastructure necessary to quickly implement interactive protocols. Our framework also provides a series of specialized tools that enable different cryptosystems to interoperate. This paper describes Charm and the various capabilities provided through our modular architecture. Through several examples, we show that our approach produces a potential order of magnitude decrease in code size compared to standard C implementations, while inducing an acceptable performance impact.

Views: 203
Microsoft Research

This a demo on using a delphi library to build pairings-based applications (Id-based crypto-systems, short signatures, attribute-based encryption, searcheable encryption .........)
[email protected]

Views: 129
kamel mohammed

Views: 313
barilanuniversity

This is part 11 of the Blockchain tutorial explaining how the generate a public private key using Elliptic Curve.
In this video series different topics will be explained which will help you to understand blockchain.
Bitcoin released as open source software in 2009 is a cryptocurrency invented by Satoshi Nakamoto (unidentified person or group of persons).
After the introduction of Bitcoin many Bitcoin alternatives were created. These alternate cryptocurrencies are called Altcoins (Litecoin, Dodgecoin etc).
Bitcoin's underlying technology is called Blockchain.
The Blockchain is a distributed decentralized incorruptible database (ledger) that records blocks of digital information. Each block contains a timestamp and a link to a previous block.
Soon people realises that there many other use cases where the Blockchain technology can be applied and not just as a cryptocurrency application.
New Blockchain platforms were created based on the Blockchain technology, one of which is called Ethereum.
Ethereum focuses on running programming code, called smart contracts, on any decentralized application.
Using the new Blockchain platforms, Blockchain technology can be used in supply chain management, healthcare, real estate, identity management, voting, internet of things, etcetera, just to name a few.
Today there is a growing interest in Blockchain not only in the financial sector but also in other sectors.
Explaining how Blockchain works is not easy and for many the Blockchain technology remains an elusive concept.
This video series tries to explain Blockchain to a large audience but from the bottom up.
Keywords often used in Blockchain conversation will be explained.
Each Blockchain video is short and to the point.
It is recommended to watch each video sequentially as I may refer to certain Blockchain topics explained earlier.
Check out all my other Blockchain tutorial videos
https://goo.gl/aMTFHU
Subscribe to my YouTube channel
https://goo.gl/61NFzK
The presentation used in this video tutorial can be found at:
http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html
The presentation used in this video tutorial can be found at:
http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html
The python script used in the video:
https://www.mobilefish.com/download/cryptocurrency/bitcoin_ec_key_generation.py.txt
Cryptocurrency address generator and validator:
https://www.mobilefish.com/services/cryptocurrency/cryptocurrency.html
Desmos graph:
https://www.desmos.com/calculator/kkj2efqk5x
James D'Angelo, Bitcoin 101 Elliptic Curve Cryptography Part 4:
https://youtu.be/iB3HcPgm_FI
#mobilefish #blockchain #bitcoin #cryptocurrency #ethereum

Views: 16979
Mobilefish.com

This short video introduces the concept of a lattice, why they are being considered as the basis for the next generation of public key cryptography, and a short walk through of a specific encryption algorithm. For a very thorough paper designed to be readable for undergraduates I highly recommend https://eprint.iacr.org/2015/938.pdf.
*One technical note: At 1:30 I claim that lattices are composed only of integers. This is not true. Some lattices only contain integers, but in general any rational number will do.

Views: 6842
Matthew Dozer

Including Packages
=======================
* Base Paper
* Complete Source Code
* Complete Documentation
* Complete Presentation Slides
* Flow Diagram
* Database File
* Screenshots
* Execution Procedure
* Readme File
* Addons
* Video Tutorials
* Supporting Softwares
Specialization
=======================
* 24/7 Support
* Ticketing System
* Voice Conference
* Video On Demand *
* Remote Connectivity *
* Code Customization **
* Document Customization **
* Live Chat Support
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Call Us:+91 967-774-8277, +91 967-775-1577, +91 958-553-3547
Shop Now @ http://clickmyproject.com
Get Discount @ https://goo.gl/lGybbe
Chat Now @ http://goo.gl/snglrO
Visit Our Channel: http://www.youtube.com/clickmyproject
Mail Us: [email protected]

Views: 23
Clickmyproject

Gagner Technologies offer this project.This project has five modules. This project based on IEEE transactions 2012. Contact: Gagner Technologies, #7 police quarters Road(Behnid Bus T.Nagar Bus Satnd), T.Nagar, Chennai-17,web:www.gagner.in mail:[email protected] call to: 9092820515

Views: 721
Prabakaran Murugesan

Autonomous Key Management (AKM) is a new cryptographic Key Management System for Internet of Things device network authentication that offers lower cost, lower latency and increased security compared to those based entirely on public key infrastructure (PKI)

Views: 371
Olympus Sky

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: 812
The Audiopedia

Views: 4488
barilanuniversity

ABSTRACT:The mediated certificateless encryption (mCL-PKE) scheme solves the key escrow problem and certificate revocation problem. mCL-PKE scheme does not utilize pairing operations. Since most CL-PKC schemes are based on bilinear pairing and are computationally expensive. The security mediator acts as a policy enforcement point as well and supports instantaneous revocation of compromised or malicious users. It is more efficient than the pairing based scheme. By applying mCL-PKE scheme can construct a practical solution to the problem of sharing sensitive information in the public clouds.

Views: 317
Rakesh G

Doubly-efficient zkSNARKs without trusted setup
Riad S. Wahby (Stanford)
Presented at the
2018 IEEE Symposium on Security & Privacy
May 21–23, 2018
San Francisco, CA
http://www.ieee-security.org/TC/SP2018/
ABSTRACT
We present a zero-knowledge argument for NP with low communication complexity, low concrete cost for both the prover and the verifier, and no trusted setup, based on standard cryptographic assumptions. Communication is proportional to d log G (for d the depth and G the width of the verifying circuit) plus the square root of the witness size. When applied to batched or data-parallel statements, the prover's runtime is linear and the verifier's is sub-linear in the verifying circuit size, both with good constants. In addition, witness-related communication can be reduced, at the cost of increased verifier runtime, by leveraging a new commitment scheme for multilinear polynomials, which may be of independent interest. These properties represent a new point in the tradeoffs among setup, complexity assumptions, proof size, and computational cost. We apply the Fiat-Shamir heuristic to this argument to produce a zero-knowledge succinct non-interactive argument of knowledge (zkSNARK) in the random oracle model, based on the discrete log assumption, which we call Hyrax. We implement Hyrax and evaluate it against five state-of-the-art baseline systems. Our evaluation shows that, even for modest problem sizes, Hyrax gives smaller proofs than all but the most computationally costly baseline, and that its prover and verifier are each faster than three of the five baselines.

Views: 438
IEEE Symposium on Security and Privacy

Novel Identity based algorithm to serve as a replacement to PKI for authentication in IoT.

Views: 171
Bharath Alva

Leon Groot Bruinderink and Andreas Hülsing and Tanja Lange and Yuval Yarom, CHES 2016. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=27851

Views: 433
TheIACR

World War II Videos
The Purple Machine was an Allied codename for one of several Japanese cipher machines used during World War Two. The nickname Purple Machine was derived from the name of the code the machine produced. The first intercepted Japanese code was dubbed "Orange" by American code breakers. As the codes increased in sophistication and difficulty to decipher, cryptologists referred to the various cipher permutations with the names of colors. "Purple" was the most difficult Japanese code to break, and was used to transmit diplomatic messages from 1939 until 1945.
The mechanics of the Purple Machine were similar to other Axis encoding machines, such as the German Enigma cipher. The Purple Machine used the twenty-six-letter Latin alphabet, programmed into a pegboard with corresponding wires that governed cipher wheels, or rotors. The machine itself consisted of a typewriter joined by wires and a circuit board to a series of four rotors that shifted the type in various permutations on a second typewriter to produce coded text. The coded text was sent by wire, preceded by a series of coded numbers that revealed the permutations used to create the code. With the setting adjusted as specified, the encoded text could then be deciphered by again running it through the machine.
While many pre-war Japanese codes were broken mathematically with pen and paper, effectively deciphering Purple required constructing an identical cipher machine. American cryptologist William Friedman built a replica of the Purple Machine, based on intelligence information, in 1939. When the machine became operational, American code breakers were able to monitor most Japanese diplomatic messages that used the Purple code.
While breaking Purple gave U.S. intelligence services a great deal of information regarding diplomatic activities and strategies, it seldom yielded specific information regarding naval actions or fleet positions. The Japanese used a separate code for military operations, fleet positions, and troop deployments. In the months prior to the bombing of Pearl Harbor in 1941, Purple Machine intercepts indicated that the Japanese were planning an attack, but the messages did not mention Hawaii, Pearl Harbor, or a date for such an attack. However, the Japanese government did use Purple to deliver their ultimatum the day before the attack. Cryptologists decoded the series of fourteen messages between the Japanese government and their embassy in Washington, D.C., and passed the messages along to the Department of the Navy. A further intercept in the early hours of December 7, 1941, indicated that the Japanese fleet was poised and awaiting the order to attack. No action was taken on the information in the intercepts, and the U.S. Pacific fleet was bombed in port at Pearl Harbor later that day.
After Pearl Harbor, deciphered Purple Machine intercepts yielded substantial intelligence information for the United States. Paired with deciphered Japanese Navy dispatches that used another broken code, Purple Machine intercepts helped the United States to victory at the battle of Midway. In the weeks before the battle, code breakers discovered a series of messages from Tokyo to Japanese diplomats and Navy officers that discussed battle strategy in the Pacific. Some of the communications yielded fleet positions. Decoded Purple messages also allowed Allied planes to track and shoot down a military flight carrying Japanese Admiral Isoroku Yamamoto.
Breaking Purple Machine code even aided the Allied effort on the European front. A long series of dispatches between Japanese diplomats in Germany and the Japanese command in Tokyo discussed meetings with Hitler and revealed information about German defenses in occupied France. This information helped Allied forces prepare for the D-Day invasion of the continent.
The Japanese remained confident throughout the war that the Purple Machine and its code remained unbroken by the Allies, and continued to use the code even in the weeks immediately following their surrender in 1945. In United States hearings regarding intelligence, military, and political oversights in the days prior to Pearl Harbor, the government revealed that it broke the Purple code before the outbreak of the war. It was the first time former Japanese forces heard that the secrecy of the Purple Machine had been long compromised.

Views: 31283
2bn442RCT

Pairings on elliptic curves have allowed the development of new cryptographic protocols like anonymous certificates, multicanal broadcasting... For an elliptic curve, or more generally a Jacobian, computing the pairing uses an algorithm due to Miller that explicitly compute some functions associated to divisors on the curve. In this talk, we show how one can use Riemann relations on the Theta model to compute the Tate and Weil pairings on abelian varieties that are not necessarily Jacobians. We show how to generalize this to pairings reducing the loop length of Miller's algorithm (ate, twisted ate, optimal ate), and also how to compute symmetric pairings on Kummer varieties. While elaborated for general abelian varieties, this algorithm is surprisingly fast in low dimension, and is almost competitive with the fastest known pairings computation on elliptic curves. This is a joint work with David Lubicz.

Views: 134
Microsoft Research

Converting Cryptographic Schemes from Symmetric to Asymmetric Bilinear Groups by Masayuki Abe, Miyako Ohkubo, Jens Groth, Takeya Tango. Talk at Crypto 2014.

Views: 357
TheIACR

This talk is about efficient pairing computation on elliptic curves. I will discuss particularly implementation-friendly curves, the use of the polynomial parameter representation to compute pairings on BN curves, and reasons to use affine coordinates for pairings at high security levels. This contains joint work with P. Barreto, G. Pereira, M. Simpl├¡cio Jr, P. Schwabe, R. Niederhagen, K. Lauter, and P. Montgomery.

Views: 737
Microsoft Research

Speaker: Demian Kostelny, Software Developer.
The talk was presented at the Dynamic Talks #4 in Lviv.

Views: 175
Grid Dynamics

Russell W. F. Lai, Friedrich-Alexander-University Erlangen-Nürnberg, Chinese University of Hong Kong; Christoph Egger and Dominique Schröder, Friedrich-Alexander-University Erlangen-Nürnberg; Sherman S. M. Chow, Chinese University of Hong Kong
Password remains the most widespread means of authentication, especially on the Internet. As such, it is the Achilles heel of many modern systems. Facebook pioneered using external cryptographic services to harden password-based authentication in a large scale. Everspaugh et al. (USENIX Security ’15) provided the first comprehensive treatment of such a service and proposed the PYTHIA PRF-Service as a cryptographically secure solution. Recently, Schneider et al. (ACM CCS ’16) proposed a more efficient solution which is secure in a weaker security model.
In this work, we show that the scheme of Schneider et al. is vulnerable to offline attacks just after a single validation query. Therefore, it defeats the purpose of using an external crypto service in the first place and it should not be used in practice. Our attacks do not contradict their security claims, but instead show that their definitions are simply too weak. We thus suggest stronger security definitions that cover these kinds of real-world attacks, and an even more efficient construction, PHOENIX, to achieve them. Our comprehensive evaluation confirms the practicability of PHOENIX: It can handle up to 50% more requests than the scheme of Schneider et al. and up to three times more than PYTHIA.
View the full program: https://www.usenix.org/sec17/program

Views: 285
USENIX

Views: 118
Sofia Flynn

Christophe Arene, *Tanja Lange, Michael Naehrig, Christophe Ritzenthaler
*Department of Mathematics and Computer Science
Technische Universiteit Eindhoven
P.O. Box 513, 5600 MB Eindhoven
Netherlands
Email: [email protected]
Manuscript number: JNT-D-09-00332R1

Views: 1843
JournalNumberTheory

This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.

Views: 5875
Udacity

Kidner can help Kidney Paired Exchange programs to detect life-saving opportunities & improve access to kidney transplants. #blockchain #HealthIT - Join us now!
WEBSITE : www.kidner-project.com
PAPER : "KIDNER – A WORLDWIDE DECENTRALISED MATCHING SYSTEM FOR KIDNEY TRANSPLANTS"
http://journals.ukzn.ac.za/index.php/JISfTeH/article/view/287/788
Kidner is a platform that helps people finding match for kidney exchange. It's a global database, Blockchain-based, secured with cryptographic tools. Today, when someone is willing to give a kidney to a sick parent as an act of generosity, it’s not always a fit from a medical point of view, but what if someone else is in the exact same situation and they can swap kidneys? Numbers have shown that it is better to have a transplant from a living donor. Unfortunately, it is not always easy to find both will & compatibility. So with Kidner, if you have found the “will” we will help with “compatibility” part. Thanks to the Blockchain, you join a global and secure database of people exactly in the same situation as yours without border issues. You increase the chance to find a proper match while being fully protected. Privacy and confidentiality are preserved thanks to encryption tools, and certificates - which you need to join the platform - are issued by a Doctor. Everything else is decentralized and happens in real time. When a match is found, you are notified by Kidner and your Doctor receives all the information needed to arrange the operation logistics.
If you want to help on this project, feel free to contact us on twitter : @KidnerProject

Views: 443
Kidner Project

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NEX - NEX is a platform for complex decentralized cryptographic trade and payment service.
Problem
Centralized exchanges are prone to hacks, slow and are expensive.
Product / Solution
Neon Exchange (NEX), a new decentralized exchange on the NEO blockchain that applies a publicly verifiable off-chain matching engine to handle massive trading volume and support complex orders (such as limit orders) that are not possible on existing DEXs
Works by placing order book directly on the blockchain. Automated Market Maker function to find best price.
Differentiating factor is DEX are actually quite slow as there are no state channels. NEX remedies that with their tech. Always for multiple forms of payment to work like GAS for the DEX.
NEO’s 10k TPS allows for faster transactions as well as their preliminary call times for smart contracts.
- Off chain order book
- Faster
- Decentralized
- Safer
3rd party integration for fund exchanges for larger customers
Wants to store private key CLIENT side - Need clarification on this.
Makers of orders pay NO FEE while the takers pay a small fee.
Built on Elixir which is built on ErLand (used for telecommunications)
Allows NEO smart contracts to interact with assets that live outside of the NEO virtual machine
Token Function
To allows transfers and enable off chain purchases.
The NEX token allows holders to claim a share of fees generated by the payment service and exchange. In total, 50 million tokens will be issued that entitle holders to a share of the fees taken by the exchange and payment service. NEX holders can claim their profits through a staking process, where claims on the staked NEX operate similar to GAS claim calculations on the NEO network
Issues
Loopring and Ox are established players with a lot of connections.
ETH pairing not until 2018. No mention of BTC
ICO / Token Metrics
50 Million Total - WOWWWWWW
25 m to public
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Hi Victor (SyncFab)

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