Cryptographic attacks | Cryptographic hash functions
In cryptography, a collision attack on a cryptographic hash tries to find two inputs producing the same hash value, i.e. a hash collision. This is in contrast to a preimage attack where a specific target hash value is specified. There are roughly two types of collision attacks: Classical collision attackFind two different messages m1 and m2 such that hash(m1) = hash(m2). More generally: Chosen-prefix collision attackGiven two different prefixes p1 and p2, find two appendages m1 and m2 such that hash(p1 ∥ m1) = hash(p2 ∥ m2), where ∥ denotes the concatenation operation. (Wikipedia).
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