Replay protection for CAVE based AKA when moving R-UIM between mobiles. High level of proposal. At re-synchronization, a mobile generates a 64 bit random number that is sent to network.
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But then IK dependent on 128-bit MS_AUTS* which includes 64 bits from mobile
Hence probability it work is less than 2^64
Forces re-synchronizations to get repeated random from mobile
At best birthday paradox, i.e. 2^32, but
MS_AUTS* (and hence MS_VERIFY and IK) depends on challenge sent so even if mobile reselects same random there is 1 in 2^64 chance that MS_AUTS* will be the same unless responding to same challenge as original. In latter case only actual random number from mobile will work.