Cryptology ePrint Archive: Report 2010/643

Construct MD5 Collisions Using Just A Single Block Of Message

Tao Xie and Dengguo Feng

Abstract: So far, all the differential attacks on MD5 were constructed through multi-block collision method. Can collisions for MD5 be found using just a single block of message (i.e. 512-bit)? This has been an open problem since the first 2-block collision attack was given. Today, in the last month (Dec,) of 2010, we have to make public a result of our 1-block collision attacks on MD5 in Table 1 as below, which was actually obtained at the beginning of 2010, but for security reasons, the techniques are not allowed to be disclosed at the moment. Here, we are calling for a challenge to the cryptology community that, any one who first gives a new different 1-block collision attack on MD5 will win 10,000 US dollars (about 50,000 RMB in Chinese Yuan) as a reward for his (her) excellent work. This call for challenge will be ended on Jan 1st, 2013. This announcementís first affiliated unit will be responsible for this amount of reward when a new different 1-block collision attack is received and verified.

Category / Keywords: 1-Block MD5 Collision Attack,Challendge, Reward

Publication Info: No Publication

Date: received 16 Dec 2010, last revised 24 Dec 2010

Contact author: hamishxie at vip sina com

Available format(s): PDF | BibTeX Citation

Note: Important Revision!!! This is a replacement of the previous paper.

Version: 20101225:061128 (All versions of this report)

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