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The MD6 Message-Digest Algorithm is a cryptographic hash function. It uses a Merkle tree-like structure to allow for immense parallel computation of hashes for very long inputs. Authors claim a performance of 28 cycles per byte for MD6-256 on an Intel Core 2 Duo and provable resistance against differential cryptanalysis. [3]
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.
Comparing message digests (hash digests over the message) calculated before, and after, transmission can determine whether any changes have been made to the message or file. MD5 , SHA-1 , or SHA-2 hash digests are sometimes published on websites or forums to allow verification of integrity for downloaded files, [ 8 ] including files retrieved ...
The values returned by a hash function are called hash values, hash codes, hash digests, digests, or simply hashes. [2] The values are usually used to index a fixed-size table called a hash table. Use of a hash function to index a hash table is called hashing or scatter-storage addressing.
JCE supplements the Java platform, which already includes interfaces and implementations of message digests and digital signatures. Installation is specific to the version of the Java Platform being used, with downloads available for Java 6, Java 7, and Java 8. "The unlimited policy files are required only for JDK 8, 7, and 6 updates earlier ...
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information.
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However, a collision, consisting of finding two different messages that produce the same message digest, requires on average only about 1.2 × 2 L/2 evaluations using a birthday attack. Thus the strength of a hash function is usually compared to a symmetric cipher of half the message digest length. SHA-1, which has a 160-bit message digest, was ...