Read the online article titled "Announcing the Advanced Encryption Standard (AES)". It is recommended that this document on the FIPS 197 standard be read. Explain briefly how this cryptosystem came to be and how it was built.

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Cryptography

Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.