| 摘要 |
An embodiment of the present invention includes a technique to register a client to a server for communication. A message containing an identification (ID) code is transmitted to a server. If the key is stored in the server, the key encrypted with the ID code is received from the server via a network. The encrypted key is decrypted using the identification code. Otherwise, the key is encrypted using the ID code. The encrypted key is transmitted to the server via the network. Information is exchanged with the server via the network. The information is encrypted and decrypted by the key.
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