--- Peter Gutmann <pgut001@...> wrote:
Analysis of Step-Reduced SHA-256,
http://eprint.iacr.org/2008/130
Collisions and other Non-Random Properties for
Step-Reduced SHA-256,
http://eprint.iacr.org/2008/131
Attacking Reduced Round SHA-256,
http://eprint.iacr.org/2008/142
Very brief summary: Attacks are feasible against just
over 1/3 of the
64
rounds (meaning if you reduce SHA-256 to 23 or 24
rounds, it's
vulnerable).
That number is slowly creeping upwards.
Peter.
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