Patent ID: 8411862

Claim:
A first node for a communication system comprising the first node and a second node, wherein, in a first communication procedure: the first node derives (i) a first cryptosynchronization value (e.g., TimeStampLong(IR)) and (ii) a second cryptosynchronization value (e.g., TimeStampShort(IR)) based on (i) first node system time (e.g., SystemTime(IR)) and (ii) a cryptosynchronization adjustment value (e.g., x), wherein the cryptosynchronization adjustment value is selected to be greater than an expected maximum difference between the first node system time and the second node system time; the first node generates an initiator message digest based on the first cryptosynchronization value; the first node transmits the initiator message digest and the second cryptosynchronization value to the second node; the second node generates a third cryptosynchronization value (e.g., TimeStampLong(RR)) based on (i) the second cryptosynchronization value received from the first node and (ii) second node system time (e.g., SystemTime(RR)); the second node generates a responder message digest based on the third cryptosynchronization value; and the second node compares (i) the initiator message digest received from the first node and (ii) the responder message digest to determine whether the first communication procedure fails.