Instruction Manual

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What is AES encryption?

In cryptography, the Advanced Encryption Standard (AES) is an encryption standard

adopted by the U.S. government. The standard comprises three block ciphers, AES-128, AES-

192

and AES-256, adopted from a larger collection originally published as Rijndael. Each AES cipher

has a 128-bit 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, 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 5-year standardization process in which

fifteen competing designs were present

ed and evaluated before Rijndael was selected as the most

suitable (see Advanced Encryption Standard process for more details). It became effective as a

standard May 26, 2002. As of 2009, AES is one of the most popular algorithms used in symmetric

key cryp

tography.[citation needed] 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.

The Rijndael cipher was developed by two Belgian cryptographers, Joan Daemen and

Vincent Rijmen, and submitted by them to the AES selection process. Rijndael is a portmanteau of

the names of the two inventors.

This article are excerpts from wikipedia, the free encyclopedia