Round key

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Definitions:

One of the \(Nr+1\) arrays of four words that are derived from the block cipher key using the key expansion routine; each round key is an input to an instance of ADDROUNDKEY() in the AES block cipher.
Sources:
FIPS 197 [NIST FIPS 197-upd1]

Glossary Comments

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See NISTIR 7298 Rev. 3 for additional details.