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 ?
com process creates a digital fingerprint of any size or type of digital file and then sends the fingerprint, not the file, over the Internet to be time-stamped, linked to a user's account information, stored on highly secure, multiple servers and then backed up in co-locations.
WSQ is a wavelet transform based compression standard designed by the FBI for compression of digital fingerprint images.
The population register of Emirates Identity Authority (Emirates ID) has more than 103 million digital fingerprints and more than 15 million digital facial recognition records, which includes multiple records of each UAE resident, and digital signatures as of mid-October 2012.
Department of Homeland Security (DHS) today began collecting biometrics - digital fingerprints - from non-U.
Biometrics, digital fingerprints and a photograph, have been collected from all non-US citizens between the ages of 14 and 79 at the airport for more than four years.
It may be many years before the hill impact of digital fingerprints become clear.
13] Live scanning, in which video cameras and computers directly read digital fingerprints, allows agencies to transmit prints to other agencies, including the FBI.
It's been a problem for as long as there's been personal computers,'' Myhrvold said, adding that technology has been developed to leave digital fingerprints on DVD movies, giving authorities an easier time in the future.
Don't miss this opportunity to get your Free Child Safety Kit, including digital fingerprints and photograph.
The nonprofit puts on a variety of child safety fairs across the country and provides the opportunity for families to have FBI-quality digital fingerprints and photographs of their children.
The population register of Emirates ID has over 103 million digital fingerprints and over 15 million digital facial recognition records, which includes multiple records of each UAE resident, and digital signatures as of October 11, senior officials said.

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