Advanced Encryption Standard: Difference between revisions
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AES encrypts data in 128-bit blocks and can take a 128, 192 or 256-bit key. DES used 64-bit blocks and a 56-bit key. | AES encrypts data in 128-bit blocks and can take a 128, 192 or 256-bit key. DES used 64-bit blocks and a 56-bit key. | ||
Starting in the late 90s, the US [[National Institute of Standards and Technology]] (NIST) ran a competition to find a block cipher to replace DES. Fifteen candidates were submitted; for descriptions of the criteria | Starting in the late 90s, the US [[National Institute of Standards and Technology]] (NIST) ran a competition to find a block cipher to replace DES. Fifteen candidates were submitted; for descriptions of the criteria used and of all candidates see [[AES competition]]. | ||
In October 2002, they announced [http://www.nist.gov/public_affairs/releases/g00-176.htm] the winner — '''Rijndael''' (pronounced approximately "rhine doll"), from two Belgian designers. That algorithm is now the Advanced Encryption Standard. | In October 2002, they announced [http://www.nist.gov/public_affairs/releases/g00-176.htm] the winner — '''Rijndael''' (pronounced approximately "rhine doll"), from two Belgian designers. That algorithm is now the Advanced Encryption Standard. | ||
Revision as of 00:20, 26 July 2009
The Advanced Encryption Standard, or AES, is a US government specification for a block cipher to replace the earlier and weaker Data Encryption Standard (DES).
AES encrypts data in 128-bit blocks and can take a 128, 192 or 256-bit key. DES used 64-bit blocks and a 56-bit key.
Starting in the late 90s, the US National Institute of Standards and Technology (NIST) ran a competition to find a block cipher to replace DES. Fifteen candidates were submitted; for descriptions of the criteria used and of all candidates see AES competition.
In October 2002, they announced [1] the winner — Rijndael (pronounced approximately "rhine doll"), from two Belgian designers. That algorithm is now the Advanced Encryption Standard.
The NIST page on AES [2] has much detail, including links to all the Rinjdael design documents, to several implementations, and to the official standard, approved as FIPS 197,