Kryptografia
Data: 2011-09-18, Autor: maksiim, Dodał: Karol, Dział: KryptografiaWiadomości podstawowe dotyczące kryptografii oraz jej powiązanie z dziedziną komputerową. Kryptografia - pojęcie, które wielu z Was na pewno obiło się chociaż raz o uszy lecz czy jesteście w stanie powiedzieć coś więcej na ten temat? Jeśli tak to bardzo miło wiedzieć jeśli zaś nie to postaram się w dość prosty i zrozumiały sposób przybliżyć Wam to zagadnienie
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Fast implementation and fair comparison of the final candidates for Advanced Encryption Standard using Field Programmable Gate Arrays
Data: 2011-09-25, Autor: Kris Gaj, Pawel Chodowiec, Dodał: Karol, Dział: Kryptografia
The results of fast implementations of all five AES final candidates using Virtex Xilinx Field Programmable Gate Arrays are presented and analyzed. Performance of several alternative hardware architectures is discussed and compared. One architecture optimum from the point of view of the throughput to area ratio is selected for each of the two major types of block cipher modes. For feedback cipher modes, all AES candidates have been implemented using the basic iterative architecture, and achieved speeds ranging from 61 Mbit/s for Mars to 431 Mbit/s for Serpent. For non-feedback cipher modes, four AES candidates have been implemented using a high-throughput architecture with pipelining inside and outside of cipher rounds, and achieved speeds ranging from 12.2 Gbit/s for Rijndael to 16.8 Gbit/s for Serpent. A new methodology for a fair comparison of the hardware performance of secret-key block ciphers has been developed and contrasted with methodology used by the NSA team.
WięcejComparative Analysis of the Hardware Implementations of Hash Functions SHA-1 and SHA-512
Data: 2011-09-25, Autor: Tim Grembowski, Roar Lien, Kris Gaj, Nghi Nguyen, Peter Bellows, Jaroslav Flidr, Tom Lehman, Brian S, Dział: Kryptografia
Hash functions are among the most widespread cryptographic primi- tives, and are currently used in multiple cryptographic schemes and security protocols such as IPSec and SSL. In this paper, we compare and contrast hard- ware implementations of the newly proposed draft hash standard SHA-512, and the old standard, SHA-1. In our implementation based on Xilinx Virtex FPGAs, the throughput of SHA-512 is equal to 670 Mbit/s, compared to 530 Mbit/s for SHA-1. Our analysis shows that the newly proposed hash standard is not only orders of magnitude more secure, but also significantly faster than the old standard. The basic iterative architectures of both hash functions are faster than the basic iterative architectures of symmetric-key ciphers with equivalent security.
WięcejA brief introduction of quantum cryptography for engineers
Data: 2011-09-23, Autor: Bing Qi, Li Qian, Hoi-Kwong Lo - arXiv, 2010, Dział: KryptografiaWe present the fundamental principles behind quantum key distribution and discuss a few well-known QKD protocols. Bearing in mind that the majority of our readers are from engineering and experimental optics, we focus more on the experimental implementation of various QKD protocols rather than security analysis. Another important topic that is covered here is the study of the security of practical QKD systems.
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