Photos Karlskrona, Sweden

Karlskrona, SE

See also Photos Dec 12, 2007

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Photos Dec 11, 2007

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SHA1 Modulus Attack

by Javantea aka. Joel R. Voss
August 16, 2007

Source Code not yet available.

Collisions in hashes are quite bad news for cryptographers. Finding them is quite difficult. The current best attack against SHA1 requires 2**69 operations.

a is an array of plaintexts.
The likeliness of a collision is a function of len(a).
sha1mod1.py sha1 hashes the plaintexts modulus x.
It counts the collisions.
Plotted here is x vs collisions(x).

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