Intro to The AES-256 Cipher | HackerNoon

password: password12345678 → short key: aafeeba6959ebeeb96519d5dcf0bcc069f81e4bb56c246d04872db92666e6d4b → first round key: a567fb105ffd90cb

Deriving the round keys from the short key is out of the scope of this article. The important thing for us to understand is that a password is converted into round keys which are used in the AES ciphering process.Encode the first round key and message in hexadecimal bytes and format them in 4x4 tables :48 20 61 63 65 69 20 72 72 73 73 65 65 20 65 74

Add the round key to the message . The corresponding cells in the message and key tables are added together. The output matrix will be used in the next step.In the resulting table, use theShift rows. The first row doesn’t shift, the second-row shifts left once, the third row twice, and the last row 3 times.

a5 5a 20 be 53 2b 5a 2c → 2b 5a 2c 53 1b 2c 59 6f → 2c 59 6f 1b → 59 6f 1b 2c 00 7c 7c 47 → 7c 7c 47 00 → 7c 47 00 7c → 47 00 7c 7cMix Columns. Each column is modulo multiplied by the

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