35 series - Cryptographic algorithms
The 35 series defines the cryptographic algorithms used in network access security. There are algorithms for the following security features:
The algorithms are publicly defined: their security relies on shared knowledge of a secret key K, which is stored in the mobile's USIM and the home network's authentication centre. K is used by the authentication algorithm, which also computes two additional keys CK and IK that are used for encryption and integrity protection.
The most useful introduction is the 33 series specification TS 33.105.
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