| 摘要 |
<p>A data server derives information regarding the identities of users placing calls in a circuit-switched communication network. It performs this task by initially establishing at least one known and trusted identity 'seed'. The data server uses the trusted identity seed, in conjunction with information regarding calls placed in the circuit-switched communication network, to derive additional user identities. Further, a user device may encrypt its secret identification number before transmitting it to the data server to maintain the secrecy of this information. The data server is additionally configured to modify previously derived identities when the server determines that they have become inaccurate.</p> |
