The MD4 Message-Digest Algorithm is a cryptographic hash function developed by Ronald Rivest in 1990. The digest length is 128 bits. The algorithm has influenced later designs, such as the MD5 , SHA-1 and RIPEMD algorithms. The initialism "MD" stands for "Message Digest".
6-415: MD4 or MD 4 or MD-4 can refer to: MD4 Maryland's 4th congressional district Maryland Route 4 [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to
12-473: A 43-byte ASCII input and the corresponding MD4 hash: Even a small change in the message will (with overwhelming probability) result in a completely different hash, e.g. changing d to c : The hash of the zero-length string is: The following test vectors are defined in RFC 1320 (The MD4 Message-Digest Algorithm) Let: Note that two hex-digits of k1 and k2 define one byte of the input string, whose length
18-511: Is used to compute NTLM password-derived key digests on Microsoft Windows NT, XP, Vista, 7, 8, 10 and 11. Weaknesses in MD4 were demonstrated by Den Boer and Bosselaers in a paper published in 1991. The first full-round MD4 collision attack was found by Hans Dobbertin in 1995, which took only seconds to carry out at that time. In August 2004, Wang et al. found a very efficient collision attack, alongside attacks on later hash function designs in
24-603: The MD4/MD5/SHA-1/RIPEMD family. This result was improved later by Sasaki et al., and generating a collision is now as cheap as verifying it (a few microseconds). In 2008, the preimage resistance of MD4 was also broken by Gaëtan Leurent, with a 2 attack. In 2010 Guo et al published a 2 attack. In 2011, RFC 6150 stated that RFC 1320 (MD4) is historic (obsolete). The 128-bit (16-byte) MD4 hashes (also termed message digests ) are typically represented as 32-digit hexadecimal numbers. The following demonstrates
30-441: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=MD-4&oldid=932989264 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages MD4 The security of MD4 has been severely compromised. The first full collision attack against MD4
36-427: Was published in 1995, and several newer attacks have been published since then. As of 2007, an attack can generate collisions in less than two MD4 hash operations. A theoretical preimage attack also exists. A variant of MD4 is used in the ed2k URI scheme to provide a unique identifier for a file in the popular eDonkey2000 / eMule P2P networks. MD4 was also used by the rsync protocol (prior to version 3.0.0). MD4
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