CIPHER COMMUNICATION METHOD AND STORAGE MEDIUM RECORDING ITS PROGRAM

摘要

PROBLEM TO BE SOLVED: To relieve the load of a sender and to save computer resources by allowing a user of cipher communication to select an optimum encryption algorithm while keeping the security of the cipher communication under a network computing environment. SOLUTION: A key length selection section 303 retrieves an encryption algorithm and an encryption key from an encryption key registration table 304 by using a recipient ID entered to a recipient entry section 301 and converted into a network class and importance information entered to a communication message importance entry section 302 as keys, and an encryption processing section 305 encrypts a message by using them when the result of retrieval shows the encryption algorithm and encryption key are existent and a message transmission section 306 transmits the encrypted message via a communication channel. When the result of retrieval shows they are not existent in the table, the message is transmitted as a plain message without being encrypted.