 |
 |
|
 |
 |
|
|
|
|
|
|
Encyclopedia :
M :
MD :
MD4 |
|
MD4 is a message digest algorithm (the fourth in a series) designed by Professor Ronald Rivest of MIT in 1990. 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. In August 2004, researchers reported generating collisions in MD4 using "hand calculation" [1]. MD4 hashesThe 128-bit (16-byte) MD4 hashes (also termed message digests) are typically represented as 32-digit hexadecimal numbers. The following demonstrates a 43-byte ASCII input and the corresponding MD4 hash: :MD4("The quick brown fox jumps over the lazy dog") = 1bee69a46ba811185c194762abaeae90 Even a small change in the message will (with overwhelming probability) result in a completely different hash, e.g. changing d to c: :MD4("The quick brown fox jumps over the lazy cog") = b86e130ce7028da59e672d56ad0113df The hash of the zero-length string is: :MD4("") = 31d6cfe0d16ae931b73c59d7e0c089c0
See alsoReferencesExternal links
|
|
|
This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License. |
|
| © 2008 Chamas Enterprises Inc. |
