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In cryptography, the Advanced Encryption Standard (AES) is a symmetrickey encryption standard adopted by the U.S. government. The standard comprises three block ciphers, AES128, AES192 and AES256, adopted from a larger collection originally published as Rijndael. Each of these ciphers has a 128bit block size, with key sizes of 128, 192 and 256 bits, respectively. The AES ciphers have been analyzed extensively and are now used worldwide, as was the case with its predecessor,^{[3]} the Data Encryption Standard (DES).
AES was announced by National Institute of Standards and Technology (NIST) as U.S. FIPS PUB 197 (FIPS 197) on November 26, 2001 after a 5year standardization process in which fifteen competing designs were presented and evaluated before Rijndael was selected as the most suitable (see Advanced Encryption Standard process for more details). It became effective as a Federal government standard on May 26, 2002 after approval by the Secretary of Commerce. It is available in many different encryption packages. AES is the first publicly accessible and open cipher approved by the NSA for top secret information (see Security of AES, below).
The Rijndael cipher was developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen, and submitted by them to the AES selection process.^{[4]} Rijndael (Dutch pronunciation: [ˈrɛindeməl]^{[5]}) is a wordplay based upon the names of the two inventors.
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