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hash function
(redirected from Hashing function)

   Also found in: Wikipedia, Hutchinson 0.03 sec.

hash function

An algorithm that turns a variable-sized amount of text into a fixed-sized output (hash value). Hash functions are used in creating digital signatures, hash tables and short condensations of text for analysis purposes (see hash buster). Hash functions are also known as "cryptographic hash functions." See hash table and one-way hash function.


(programming)hash function - A hash coding function which assigns a data item distinguished by some "key" into one of a number of possible "hash buckets" in a hash table. The hash function is usually combined with another more precise function.

For example a program might take a string of letters and put it in one of twenty six lists depending on its first letter. Ideally, a hash function should distribute items evenly between the buckets to reduce the number of hash collisions. If, for example, the strings were names beginning with "Mr.", "Miss" or "Mrs." then taking the first letter would be a very poor hash function because all names would hash the same.


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Ideal for use in e-commerce server applications, the SafeXcel-ISES chip provides extremely fast cryptographic acceleration for large number exponentiation, symmetric key and hashing functions.
The Alcatel OmniAccess 500 series VPN implementation supports IPSec, Diffie-Hellman key exchange, MD5 and SHA-1 hashing functions, DSA and RSA digital signatures, DES, 3DES and AEA encryption algorithms, as well as standards-based authentication systems, including shared secret, RADIUS, LDAP, X.
The Alcatel OmniAccess 210 combines VPN features including IPsec tunneling, Diffie-Hellman key exchange, Message Digest 5 (MD5) and Secure Hash Algorithm (SHA-1) hashing functions, Digital Signature Algorithm (DSA) and RSA digital signatures, Data Encryption Standard (DES and 3DES), and Advanced Encryption Standard (AES) encryption algorithms.
 
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