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A key that encrypts other key (typically traffic encryption keys (TEKs)) for transmission or storage.
CNSSI 4009-2015 CNSSI 4005
A key derived from the authorization key that is used to encrypt traffic encryption keys (TEK) during the TEK exchange.
NIST SP 800-127 under Key encryption key (KEK)
A cryptographic key that is used for the encryption or decryption of other keys.
NIST SP 800-57 Part 2 under Key encrypting key