[SECURITY-L] [S] SHA-1 Broken
CSIRT - UNICAMP
security em unicamp.br
Qua Fev 16 14:02:18 -02 2005
----- Forwarded message from Cristine Hoepers <cristine em nic.br> -----
From: Cristine Hoepers <cristine em nic.br>
Subject: [S] SHA-1 Broken
To: seguranca em pangeia.com.br
Date: Wed, 16 Feb 2005 12:04:40 -0200
[http://www.schneier.com/blog/archives/2005/02/sha1_broken.html]
SHA-1 Broken
SHA-1 has been broken. Not a reduced-round version. Not a simplified
version. The real thing.
The research team of Xiaoyun Wang, Yiqun Lisa Yin, and Hongbo Yu
(mostly from Shandong University in China) have been quietly
circulating a paper announcing their results:
* collisions in the the full SHA-1 in 2**69 hash operations, much
less than the brute-force attack of 2**80 operations based on
the hash length.
* collisions in SHA-0 in 2**39 operations.
* collisions in 58-round SHA-1 in 2**33 operations.
This attack builds on previous attacks on SHA-0 and SHA-1, and is a
major, major cryptanalytic result. It pretty much puts a bullet into
SHA-1 as a hash function for digital signatures (although it doesn't
affect applications such as HMAC where collisions aren't important).
The paper isn't generally available yet. At this point I can't tell if
the attack is real, but the paper looks good and this is a reputable
research team.
More details when I have them.
Posted on February 15, 2005 at 07:15 PM
----- End forwarded message -----
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