hash function

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hash function

(programming)
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.

hash function

An algorithm that turns a variable amount of text into a small, fixed-length value called a "hash value" or "hash code." Hash functions are widely used to create codes for message authentication (see MAC). They are also employed to create lookup tables (see hash table) as well as condensations of text for content analysis (see hash buster). See one-way hash function and HMAC.
References in periodicals archive ?
The DesignWare Cryptography IP solutions for SHA-3 do not replace the SHA-2 family of hash functions, which remains secure and viable, but instead provides chipset vendors and device manufacturers with an alternative solution to future-proof their devices.
One commonly used method for deduplicating data relies on employing the Cryptographic Hash Functions to assign a value to each data and identify them with the identifier ()Joao Barreto, et al.
The one-way characteristic of hash functions can ensure that disclosure of the "substitute of the system-side OTP' will not lead back to the actual OTP.
Discussion topics also included hash functions for digital signatures, multivariate functions and Quantum Key Distribution where ETSI s role is prominent in terms of standardization through its Industry Specification Group on the subject.
The topics include radio frequency identification (RFID) authentication protocols and wide-strong privacy, a secure elliptical curve based RFID ownership transfer scheme with controlled delegations, a framework for securing RFID transmissions by varying transmitted reader's power, a comparative study of stream cyphers and hash functions of RFID authentications, and a remote attestation mechanism for embedded devices based on physical unclonable functions.
These passwords are stored as cryptographic hash functions, in which passwords of any length are converted into strings of bits of uniform length.
In 2008, Chen [14] proposed a traceable enterprise digital right management (E-DRM) scheme based on one-way hash functions for mobile devices.
SharkSSL implements the new Secure Hash Algorithm- 256 (SHA-256), which replaces outdated hash functions and can be used to verify the integrity of copies of the original data without compromising the source.
SharkSSL implements the new Secure Hash Algorithm-256 (SHA-256), which replaces outdated hash functions and can be used to verify the integrity of copies of the original data without compromising the source.
De-duplication applications use hash functions to tag duplicate data, but sometimes multiple instances of the data generate the same hash value, which causes what is known as a collision.
Key Derivation Functions [29] and hash functions MD5, SHA, SHA-2 [30] are used to format fixed-length and high entropy secret keys from the variable-length strings.
Cryptographic hash functions create an identifier based on an algorithmic digestion of a record.