ENCRYPTION COMMUNICATION METHOD AND SYSTEM

PROBLEM TO BE SOLVED: To obtain an encryption communication method for attaining encryption communication between terminals, and to provide a system. SOLUTION: The terminals register the key generating information in respectively different session management servers, which comprises a plurality of setting items required to determine a setting value for generating a usable key by own terminal and stores the candidate of the setting value in each setting item. When the encryption communication is established between the terminals, each session management server is linked with a key generating information management server, and the key generating information management server selects an encryption algorithm suite, based on the key-generating information. The session management server for generating parameters, based on the selected algorithm suite, acquires the information concerning the selected algorithm suite from the key-generating information management server, generates the key to be used for the inter-terminal encryption communication, based on the information, and distributes the key to the respective terminals. COPYRIGHT: (C)2007,JPO&INPIT