| 摘要 |
<p>A client unit (610) is attached to a network (612), and to a point of presence node (810) which is connected to the network. The client unit is connected to a merchant server (830) and to a private server (820. The client unit includes a network interface (840), a client box identifier (842), a network address storage area (846) and an encryption key storage area (844).</p> |
