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The MD5 message-digest algorithm is a widely used hash function producing a 128-bit hash value. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4, [3] and was specified in 1992 as RFC 1321. MD5 can be used as a checksum to verify data integrity against unintentional corruption.
hash MD4: 128 bits hash MD5: 128 bits Merkle–Damgård construction: MD6: up to 512 bits Merkle tree NLFSR (it is also a keyed hash function) RadioGatún: arbitrary ideal mangling function RIPEMD: 128 bits hash RIPEMD-128: 128 bits hash RIPEMD-160: 160 bits hash RIPEMD-256: 256 bits hash RIPEMD-320: 320 bits hash SHA-1: 160 bits Merkle ...
The "response" value is calculated in three steps, as follows. Where values are combined, they are delimited by colons. The MD5 hash of the combined username, authentication realm and password is calculated. The result is referred to as HA1. The MD5 hash of the combined method and digest URI is calculated, e.g. of "GET" and "/dir/index.html ...
MD5: 1992 MD4: RFC 1321: MD6: 2008 Website Specification: RIPEMD: 1992 The RIPE Consortium [1] MD4: RIPEMD-128 RIPEMD-256 RIPEMD-160 RIPEMD-320: 1996 Hans Dobbertin Antoon Bosselaers Bart Preneel: RIPEMD: Website Specification: SHA-0: 1993 NSA: SHA-0: SHA-1: 1995 SHA-0: Specification: SHA-256 SHA-384 SHA-512: 2002 SHA-224: 2004 SHA-3 (Keccak ...
md5sum is a computer program that calculates and verifies 128-bit MD5 hashes, as described in RFC 1321. The MD5 hash functions as a compact digital fingerprint of a file. As with all such hashing algorithms, there is theoretically an unlimited number of files that will have any given MD5 hash.
The sender is required to find a message whose hash value begins with a number of zero bits. The average work that the sender needs to perform in order to find a valid message is exponential in the number of zero bits required in the hash value, while the recipient can verify the validity of the message by executing a single hash function.
John Smith and Sandra Dee share the same hash value of 02, causing a hash collision. In computer science, a hash collision or hash clash [1] is when two distinct pieces of data in a hash table share the same hash value. The hash value in this case is derived from a hash function which takes a data input and returns a fixed length of bits. [2]
Therefore, in a final step, a second compression function compresses the last internal hash value (2n bits) to the final hash value (n bits). This can be done as simply as discarding half of the last 2n-bit output. SHA-512/224 and SHA-512/256 take this form since they are derived from a variant of SHA-512.