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Revision as of 23:29, 21 June 2004
MD4 is a message digest algorithm (the fourth in a series) designed by Professor Ronald Rivest of MIT. It implements a cryptographic hash function for use in message integrity checks. The digest length is 128 bits. The algorithm has influenced later designs, such as the MD5, SHA and RIPEMD algorithms.
Weaknesses in MD4 were demonstrated by Den Boer and Bosselaers in a paper published in 1991. Many of the subsequent message digest designs based on it remain secure, in the sense that no effective attack has been published against them.
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