| 摘要 |
PURPOSE:To generate a cryptographic key with high in sccrecy by converting a random number selected at random, a select code preserved by it own equipment only, identification information of opposite station and a common code to all stations by predetermined conversion. CONSTITUTION:Identification information IDi of a user (1) is the result of coding public information such as name, address and telephone number to identify the user (1). Moreover, a secret integer Si processed by the user (1) only and product (n) of plural primes are calculated by a credible manager and arranged in advance to the user (1). The user (1) inputs a cryptographic communication request to a terminal equipment 203 and loads an IC card 201 to a reader 202. The terminal equipment generates a random number R, reads the S1 and (n) from the IC card 201 to generate a work key wk, which ciphers a message desired to be sent and the result is sent to the user 2 together with the number R. In receiving the R and the ciphered message, the user 2 reads the S1 and (n) from the IC card to generate the work key wk. Then the wk is used to decode the sent ciphered message into the original plain sentence.
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