Patent ID: 7110548
Filing Date: 2006-09-19
Classification: H04L

Abstract:
1. An encryption algorithm sharing management method for sharing an encryption algorithm for cryptographic communication, comprising the steps of: from a user of a transmission side, obtaining a user identifier indicating the user and a user of the transmission side identifier indicating a user of a reception side; and querying a data base in which user identifiers indicating users, corresponding encryption algorithms and encryption keys thereof, are preliminarily described so as to obtain an encryption algorithm operated by the user of the transmission side and an encryption key thereof and an encryption algorithm operated by the user of the reception side and an encryption key thereof, wherein if said encryption algorithm operated by the user of the transmission side is different from said encryption algorithm operated by the user of the reception side, signature data produced for the encryption key operated by the user of the transmission side is transmitted to the user of the transmission side and said encryption algorithm operated by the user of the transmission side is encrypted with said encryption algorithm operated by the user of the reception side and are transmitted to the user of the reception side with signature data produced for the encryption key operated by the user of the reception side.