AES: How to Design Secure Encryption

In 1997, a contest began to develop a new encryption algorithm to become the Advanced Encryption Standard. After years of debate, one algorithm was chosen as the AES. But how does AES work? And what makes for a secure encryption algorithm?

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0:00 The Contest
1:02 Encryption
3:57 Confusion and Diffusion
5:44 Block Cipher
6:55 KeyExpansion
7:34 AddRoundKey
8:14 Substitution Cipher
8:55 SubBytes
11:30 MixColumns
12:53 ShiftRows
13:21 The Algorithm