![]() By guessing the hidden part of the state, length extension attacks on SHA-224 and SHA-384 succeed with probability 2 −(256−224) = 2 −32 > 2 −224 and 2 −(512−384) = 2 −128 > 2 −384 respectively. SHA-256 and SHA-512 are prone to length extension attacks. Pseudo-collision attack against up to 46 rounds of SHA-256. Merkle–Damgård construction with Davies–Meyer compression functionĪ 2011 attack breaks preimage resistance for 57 out of 80 rounds of SHA-512, and 52 out of 64 rounds for SHA-256.
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