Summary of AES Encryption and Decryption
The video discusses AES encryption and decryption, focusing on the structure, key size, number of rounds, transformations, and key scheduling algorithm. The AES structure involves initial transformation, round keys, and multiple rounds with different transformations. The key size (128, 192, 256 bits) determines the number of rounds (10, 12, 14). Encryption involves adding round keys and performing transformations, while decryption reverses this process. The final round in both encryption and decryption has three transformations. Key scheduling algorithm expands the key for each round. The video emphasizes understanding AES structure, encryption/decryption processes, and transformations.
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Notable Quotes
— 07:09 — « Its the mix column that is missing in the last round. »
— 08:08 — « This is a perfect example for AES 128 because the key size is 16 bytes or 128 bits. »
— 11:58 — « So the 10th round of decryption takes the round key which was actually the round key during the initial transformation. »
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Technology