Obsahuje:
  • všechny e-ziny od 9/1999
  • celou databázi NEWS
  • soutěže 2000-2011
  • další články a BONUSY

Crypto - News

http://crypto-world.info

Crypto - News | Security - News

03 / 2005
Vybrali pro vás: TR - Tomáš Rosa, JP - Jaroslav Pinkava, PV - Pavel Vondruška, VK - Vlastimil Klíma

Finding MD5 Collisions – a Toy For a Notebook

06.03.2005
Vlastimil Klima: Finding MD5 Collisions – a Toy For a Notebook, March 5, 2005
(English)
(Czech)

Abstract: One of the major cryptographic "break-through" of the recent years was a discovery of collisions for a set of hash functions (MD4, MD5, HAVAL-128, RIPEMD) by the Chinese cryptographers in August 2004 [1]. Their authors (Wang et al.) kept the algorithm secret, however. We have found a way to generate the first message block of the collision about 1000 - 2000 times faster than the Chinese team - that corresponds to reaching the first colliding block in 2 minutes using a common notebook. The same computation phase took the Chinese team about an hour using an IBM P690 supercomputer. On the other hand, the Chinese team was 2 - 80 times faster when computing the second message block of their collisions. Therefore, our and the Chinese methods probably differs in both parts of the computation. Overall, our method is about 3 - 6 times faster. More specifically, finding the first (complete) collision took 8 hours using a notebook PC (Intel Pentium 1.6 GHz). That should be a warning towards persisting usage of MD5. Note that our method works for any initialization vector. In the appendix, we show new examples of collisions for a standard and chosen initialization vectors.

Zdroj: http://cryptography.hyperlink.cz/md5/MD5_collisions.pdf
Autor: PV


Heuristické vyhledání souvisejících článků v archívu NEWS

Pozor - není zdaleka přesné a výsledek je bez záruky...
Chcete-li článek obsahující konkrétní termín - pou·ijte funkci vyhledávání !
<<- novější - Nalézání kolizí MD5 - p?vodní ?ínská metoda zve?ejn?na
Nalézání kolizí MD5 - hra?ka pro notebook - starší ->>
Design: Webdesign