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A mid-squares hash code is produced by squaring the input and extracting an appropriate number of middle digits or bits. For example, if the input is 123 456 789 and the hash table size 10 000, then squaring the key produces 15 241 578 750 190 521, so the hash code is taken as the middle 4 digits of the 17-digit number (ignoring the high digit ...
The methods resemble the block cipher modes of operation usually used for encryption. Many well-known hash functions, including MD4 , MD5 , SHA-1 and SHA-2 , are built from block-cipher-like components designed for the purpose, with feedback to ensure that the resulting function is not invertible.
Name Length Type Pearson hashing: 8 bits (or more) XOR/table Paul Hsieh's SuperFastHash [1]: 32 bits Buzhash: variable XOR/table Fowler–Noll–Vo hash function
The Secure Hash Algorithms are a family of cryptographic hash functions published by the National Institute of Standards and Technology (NIST) as a U.S. Federal Information Processing Standard (FIPS), including:
On 18 March 2006, Klima published an algorithm that could find a collision within one minute on a single notebook computer, using a method he calls tunneling. [10] Various MD5-related RFC errata have been published. In 2009, the United States Cyber Command used an MD5 hash value of their mission statement as a part of their official emblem. [11]
Hash function, an encoding of data into a small, fixed size; used in hash tables and cryptography . Hash table, a data structure using hash functions; Cryptographic hash function, a hash function used to authenticate message integrity
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information.
Hash-based cryptography is the generic term for constructions of cryptographic primitives based on the security of hash functions.It is of interest as a type of post-quantum cryptography.