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Collisions and other Non-Random Properties for Step-Reduced SHA-256
SHA-256 SHA-512 hash functions collisions
2009/6/3
We study the security of step-reduced but otherwise unmodified
SHA-256. We show the first collision attacks on SHA-256 reduced
to 23 and 24 steps with complexities 218 and 228.5, respectively. We gi...
On Authentication with HMAC and Non-Random Properties
Authentication HMAC Non-Random Properties
2008/12/15
MAC algorithms can provide cryptographically secure authen-
tication services. One of the most popular algorithms in commercial appli-
cations is HMAC based on the hash functions MD5 or SHA-1. In t...