MD4 (Message Digest Algorithm 4) is a secure
hash algorithm developed by
Rivest in 1990. The algorithm takes a message of arbitrary
length and produces a 128-bit message digest.
Attacks on versions of MD4 were developed by Den Boer and Bosselaers and
others. Dobbertin has shown how collisions for the full version of MD4 can be
found in under a minute on a typical PC. Now MD4 is considered broken and
can be used mostly as a checksum algorithm.
The MD4 algorithm is designed to be fast
on 32-bit machines.
The MD4 algorithm is
specified in RFC1186.
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