Authentication apparatus that assists input of user ID and password authentication method, and recording medium

摘要

An authentication apparatus includes an authentication determination circuit, a partial determination circuit, and a combination determination circuit. The partial determination circuit determines whether or not any one of a first set or a second set exists. The first set is a set where only the input user ID matches the registered user ID. The second set is a set where only the input password matches the registered password. The combination determination circuit generates a new set by combining the input user ID of the existing first set and the input password of another set or a similar method. The authentication determination circuit executes a user authentication if, among the generated sets, the input user ID matches the registered user ID, and the input password matches the registered password.