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Collision attack
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
SHA-1
February 2017, CWI Amsterdam and Google announced they had performed a collision attack against SHA-1, publishing two dissimilar PDF files which produced the
MD5
collision. (Previous collision discoveries had relied on multi-block attacks.) For "security reasons", Xie and Feng did not disclose the new attack method
Hash function security summary
function Collision attack Preimage attack Cipher security summary Tao Xie; Fanbao Liu; Dengguo Feng (25 March 2013). "Fast Collision Attack on MD5". Cite
Birthday attack
between two or more parties. The attack depends on the higher likelihood of collisions found between random attack attempts and a fixed degree of permutations
Preimage attack
h(x′). Collision resistance implies second-preimage resistance, but does not guarantee preimage resistance. Conversely, a second-preimage attack implies
MD4
first full collision attack against MD4 was published in 1995 and several newer attacks have been published since then. As of 2007, an attack can generate
Collision
A collision is the event in which two or more bodies exert forces on each other in about a relatively short time. Although the most common use of the
SHA-2
the best public attacks break preimage resistance for 52 out of 64 rounds of SHA-256 or 57 out of 80 rounds of SHA-512, and collision resistance for 46
Collision (computer science)
extremely hard to find collisions. Birthday attack Collision attack (against cryptographic hash functions) Collision resistance Collision resolution (hash tables)