SERVER DEVICE, KEY MANAGING DEVICE, AND ENCRYPTION COMMUNICATION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a server device in which security about a private key is enhanced more. SOLUTION: A procedure for sharing a common key is performed between a server computer 1 and a client computer 5. In such a case, the client computer 5 transmits data to be a base of the common key encrypted by a public key to the server computer 1. The server computer 1 transfers to a key server 3 the data to be the base of the common key encrypted by the public key and requests the key server 3 to decrypt the data. The key server 3 decrypts the data to be the base of the common key encrypted by the public key with a secret key corresponding to the public key to obtain the data to be the base of the common key and returns the data to the server computer 1. The server computer 1 generates a common key on the basis of the returned data to be the base of the common key. COPYRIGHT: (C)2004,JPO&NCIPI