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hash function
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   Also found in: Encyclopedia, Wikipedia 0.01 sec.

hash function

In computing, an algorithm that calculates a value from the content of a message which can then be used to detect alterations to the original message.

Similar to a checksum but with greater security, hash functions play an important role in secure cryptographic systems (see cryptography), where authentication is as important as hiding the data from third parties.


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Digital signatures typically range from 128 bits using the MD5 algorithm to 160 bits in size using the more secure SHA1 (Secure Hash Algorithm 1).
Specific functions include the Data Encryption Standard (DES) for encryption and decryption, secure key storage and Secure Hash Algorithm (SHA) acceleration.
Other cryptographic algorithms currently validated by the CMVP are the Data Encryption Standard (DES), the Triple Data Encryption Standard (TDES), the Digital Signature Algorithm (DSA), the Secure Hash Algorithm (SHA-1), and the Random Number Generator algorithm (RNG).
 
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