| 摘要 |
PROBLEM TO BE SOLVED: To provide a decoding method for eliminating the need for management of the authentication authorization information or the group information in a system, by not holding the authentication authorization information and the group information in the system, but controlling the decoding authority by the authentication authorization of an external web site.SOLUTION: A user terminal performs user account transmission and group information request transmission, a management server performs first authentication request and first authorization request, a web site server performs first authentication and first authorization and group information transmission, a management server performs generation request, a decoding server performs key set generation and process generation, a user terminal performs decoding request transmission, the decoding server performs authentication and authorization request, the management server performs second authentication request and second authorization request, the web site server performs second authentication and second authorization and result transmission, and the decoding server performs decoding. |
