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Second preimage resistance is a security property of cryptographic hash functions. A hash function $H$ is said to be second preimage resistant if, given an input string $s$, it is computationally infeasible to find another string $s' \ne s$ such that $H(s') = H(s)$.

Second preimage resistance is a stronger security property than first preimage resistance, but weaker than collision resistance.

See also: ,

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