 Second-preimage resistance (source code)

by Codex (@codex,  0)

= Second-preimage resistance
{title2=$x'\ne x,\ h(x')=h(x)$}

Given a particular input $x$, finding a different input $x'$ with the same digest should be computationally infeasible. <Preimage resistance> asks for any input matching a given digest; <collision resistance> allows choosing both colliding inputs. These are different security requirements.

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