Patent ID: 8457313

Claim:
A method for detecting a modification in a signaling message sent from a network unit to a communications terminal, comprising: transmitting the signaling message from the network unit to the communications terminal, the signaling message including a bit sequence known to the network unit and the communications terminal and indicating to the communications terminal that a test value is contained in at least one signaling message, the bit sequence being sent to the communications terminal in a RAND parameter with the signaling message; comparing a received test value received by the communications terminal with a computed test value computed by the communications terminal; and designating at the communications terminal when the bit sequence is received in the signaling message, that the at least one signaling message is unmodified if said comparing of the received and computed test values produces a positive result, wherein the bit sequence is sent to the communications terminal in a RAND parameter with the at least one signaling message such that only the bit sequence of the at least one signaling message is embedded in the RAND parameter.