High Quality Content by WIKIPEDIA articles! The Data Authentication Algorithm (DAA) is a former U.S. government standard for producing cryptographic message authentication codes. According to the standard, a code produced by the DAA is called a Data Authentication Code (DAC). The algorithm is not considered secure by today's standards. The DAA is equivalent to CBC-MAC, with DES as the underlying cipher, truncated to between 24 and 56 bits (inclusive). In cryptography, a message authentication code (often MAC) is a short piece of information used to authenticate a message. A MAC algorithm, sometimes called a keyed (cryptographic) hash function, accepts as input a secret key and an arbitrary-length message to be authenticated, and outputs a MAC (sometimes known as a tag). The MAC value protects both a message's data integrity as well as its authenticity, by allowing verifiers (who also possess the secret key) to detect any changes to the message content.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.