Patent ID: 7287270
Filing Date: 2007-10-23
Classification: G06F,G06Q,H04L

Abstract:
1. A method for authenticating a user by which a server device of a service provider authenticates a service user on a network, the method comprising: a confirmation information issuing step including receiving an authentication request from a first communication device of the service user, and then generating a confirmation information to be replied to the first communication device; an authentication step of judging whether or not the confirmation information replied to the first communication device agrees with the confirmation information sent from the service user by a second communication device using a communication path that is different from a communication path of the first communication device; obtaining first authentication requester information about a service user who makes the authentication request based on information contained in the authentication request received from the first communication device; and obtaining second authentication requester information about the service user when receiving confirmation information from the second communication device and judging whether or not the first authentication requester information agrees with the second authentication requester information, wherein the first communication device is a computer connected to the server device of the service provider via Internet, the second communication device is a telephone, the first authentication requester information is a user's name registered in advance in the server device by each service user, and the second authentication requester information is a user's name of the second communication device registered in a telephone company, wherein the second authentication requester information is obtained by performing an inquiry to a user management device of the telephone company providing the second communication device based on a telephone number of the second communication device obtained by a calling telephone number notification service provided by a telephone network.