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One-way compression functions are often built from [[block cipher]]s.
Some methods to turn any normal block cipher into a one-way compression function are '''Davies–Meyer''', '''Matyas–Meyer–Oseas''', '''Miyaguchi–Preneel''' (single-block-length compression functions) and '''MDC-2/Meyer–Schilling''', '''MDC-4''', '''Hirose''' (double-block-length compression functions). These methods are described in detail further down. ([[MDC-2]] is also the name of a hash function patented by [[IBM]].
== Compression ==
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