This is a very nice, relatively short and sweet video about AES: Advanced Encryption Standard.
It is currently one of the most secure ways of encrypting data, and is used by the US government.
AES has swept away old faithful DES, and is now the workhorse of
business and government cryptography. Our entire civil order relies on
its integrity. Here we explain how it works, and discover how a string
of simple crypto primitives combine to such a robust cipher for which no
mathematical compromise was ever published.
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