Security, Symmetric Encryption, Cryptography, Encryption.
The subkeys require 13*16Bytes=13*4 words = 52 words, which are stored in the array elements W[0],…,W[51]. Note the number of subkeys is equal to the number of rounds +1. Decryption Mechanism AES Description Note that the Decryption mechanism has some differences. The matrix used in InvMixColumn is