| 摘要 |
PURPOSE:To attain the authentication of a terminal equipment in a roaming destination network by enhancing the security and decreasing the quantity of inter-network signals. CONSTITUTION:Upon the receipt of a service request from a terminal equipment 3 by a roaming destination network 2, the roaming destination network 2 requests a verification key to a home network 1 of the terminal equipment 3. The home network 1 generates a random number (p), an authentication key K13 is generated through ciphering operation by using the (p) and a key K3 specific to the terminal equipment 3 and the key K13 and the random number (p) are returned to the roaming destination network 2. The roaming destination network 2 stores the key K13 and generates a random number (q) and generates a ciphering text C(q) by using the (q) and the K13 and the random numbers p, q are sent to the terminal equipment 3. The terminal equipment 3 uses the specific key K3 and the random number (p) stored therein and generates the authentication key K13 through ciphering operation and the key is stored and a ciphering text C(q) is generated through ciphering operation by using the K13 and the number (q) and returned to the roaming destination network 2. The network 2 compares the received C(q) with the C(q) generated precedingly and discriminates the terminal equipment 3 to be a legal terminal equipment when they are coincident. |
