| 摘要 |
<p>A system 100 for communicating over a network 102 using a Session Initiation Protocol (SIP), the system comprising a server 101 adapted to transmit a first cookie encrypted using a first key K1, receive and decrypt a second cookie using a second key K2, and compare the first cookie with the second cookie; and a client machine (CM) 103 - 107 adapted to receive and decrypt the first cookie using the first key K1, and transmit the second cookie encrypted using the second key K2.</p> |
