USIM
From Free net encyclopedia
A Universal Subscriber Identity Module is an application for UMTS mobile telephony running on a UICC smartcard which is inserted in a 3G mobile phone. It stores user subscriber information, authentication information and provides with storage space for text messages.
For authentication purposes, the USIM stores a long-term preshared secret key K, which is shared with the Authentication Center (AuC) in the network. The USIM also verifies a sequence number that must be within a range using a window mechanism to avoid replay attacks, and is in charge of generating the session keys CK and IK to be used in the confidentiality and integrity algorithms of the KASUMI block cipher in UMTS.
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