Evaluating the number of active S-boxes in dynamic AES block ciphers using mds matrices of size 4×4 and 8×8

AES (Advanced Encryption Standard) was designed by two Belgian cryptographers: Joan Daemen and Vincent Rijmen. AES was recognized as a federal encryption standard by the US National Institute of Standards and Technology on November 26, 2001 and is specified in Federal Information Processing Standard 197 (FIPS 197).