notes.md

AES

Multiplication

In AES, multiplication at the byte level is defined as:

(a * b) % 0x11B

[1] https://csrc.nist.gov/csrc/media/projects/cryptographic-standards-and-guidelines/documents/aes-development/rijndael-ammended.pdf#page=19

Notation

• Nb is the number of columns in a block. Constant. 4
• Nk is the number of words in the key. Either 4, 6 or 8.
• Nr is the number of rounds.