(mathematics) For a given function, the set of all elements of the domain that are mapped into a given subset of the codomain; (formally) given a function ƒ : X → Y and a subset B ⊆ Y, the set ƒ⁻¹(B) = {x ∈ X : ƒ(x) ∈ B}.

plural of preimage

(cryptography) An attack on a cryptographic hash function that is able to find a preimage for a hash; that is, it is able to determine (faster than by brute force) some input that results in a known hash when passed through the algorithm.

plural of preimage attack

(cryptography) An attack on a cryptographic hash function that is able to find a second preimage for a hash and its preimage; that is, given a hash and an input that has that specific hash, it is able to find (faster than by brute force) another input with the same hash.

plural of second-preimage attack

Alternative form of second preimage attack

plural of second preimage attack