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About preimage-resistance

Preimage resistance is a security property of cryptographic hash functions. A hash function $H$ is said to be (first) preimage resistant if, given a hash value $x$, it is computationally infeasible to find a string $s$ such that $H(s) = x$.

Stronger security properties often demanded of hash functions include second preimage resistance and collision resistance, both of which imply first preimage resistance.