AKA in UMTS
AKA is a mechanism which performs authentication and session key distribution in Universal Mobile Telecommunications System (UMTS) networks. AKA is a challenge-response based mechanism that uses symmetric cryptography. AKA is typically run in a UMTS IP Multimedia Services Identity Module (ISIM), which resides on a smart card like device that also provides tamper resistant storage of shared secrets. AKA is defined in RFC 3310.
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—Michael Mann, U.S. screenwriter. Frances Dollarhyde, aka “The Tooth Fairy” (Tom Noonan)