| 摘要 |
PROBLEM TO BE SOLVED: To provide an authentication method capable of avoiding spoofing login by a third person even when a user sets the same password for a plurality of Web servers, an authentication system, a Web server, a user terminal, an authentication program, and a recording medium. ! SOLUTION: An authentication method includes: a step in which a first user terminal stores an ID and a session key issued by a Web server in a tamper-resistant region; a step in which the first user terminal calculates first collation information including values which change regularly or irregularly from the ID, session key, password, and terminal name according to a Web server request and transmits the information to the Web server; a step in which the Web server stores the ID, password, and session key of the first user terminal in the tamper-resistant region of the Web server and regularly or irregularly calculates second collation information using the stored information; and a step in which the Web server verifie |
