| 摘要 |
PROBLEM TO BE SOLVED: To provide an authentication device, an authentication system, and an authentication method for updating a risk determination condition on the basis of a suspicious authentication request.SOLUTION: An authentication device 2 comprises: a risk determination table 23 in which a risk determination condition is stored; a determination unit 21 for accepting an inquiry about a type of authentication together with the access information of a user from a business device 1, determining a risk level on the basis of the access information and the risk determination condition, and specifying the type of authentication on the basis of the risk level; a response unit 22 for returning the specified type of authentication to the business device 1; an authentication processing unit 24 for accepting an authentication request together with a user inputted password from the business device 1 and processing authentication of the user on the basis of the user inputted password; a response unit 26 for returning the result of authentication to the business device 1; an update condition table 29 in which an update condition for updating the risk determination condition is stored; and an update unit 25 for updating the risk determination condition when the authentication request from the business device 1 satisfies the update condition. |
