| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fraudulent use of authentication information related to users even when the information is leaked from an authentication cooperation server.SOLUTION: The authentication cooperation system includes: a secrecy distributed decoding section 222 that decodes authentication information from at least two pieces of fragment data out of a plurality of pieces of fragment data generated from authentication information for use in authentication of a user in a service provision server 4 for providing a prescribed service, by secrecy distribution technology; and an authentication proxy section 223 that requests authentication of a user to the service provision server 4 using the authentication information decoded by the secrecy distributed decoding section 222. The fragment data is stored in an authentication cooperation server 1 and a storage area designated by a user other than the authentication cooperation server. When the user accesses from a terminal device 2 to the service provision server 4, the secrecy distributed decoding section 222 decodes the authentication information from the fragment data stored in the authentication cooperation server 1 and the fragment data stored in the storage area other than the authentication cooperation server.SELECTED DRAWING: Figure 1 |
