The Free On-line Dictionary of Computing (30 December 2018):

Advanced Encryption Standard
Rijndael

    (AES) The NIST's replacement for
   the Data Encryption Standard (DES).  The Rijndael
   /rayn-dahl/ symmetric block cipher, designed by Joan Daemen
   and Vincent Rijmen, was chosen by a NIST contest to be AES.

   AES is Federal Information Processing Standard FIPS-197.

   AES currently supports 128, 192 and 256-bit keys and
   encryption blocks, but may be extended in multiples of 32
   bits.

   (http://csrc.nist.gov/CryptoToolkit/aes/).

   Rijndael home page
   (http://esat.kuleuven.ac.be/~rijmen/rijndael/).

   (2003-07-04)