AUTHENTICATION SERVER, SYSTEM, AND METHOD THAT ALLOW CLIENT DEVICE TO LOG INTO CLIENT DEVICE AND/OR TARGET SERVICE

摘要

An authentication server that connects a client device and a target server via a first network. The authentication server includes: a storage and a processor. The storage stores user-specific information that includes a plurality of data items. The processor: upon receiving an authentication request including a user ID and a user password, an authentication ID, a biometric device ID unique to a user, or biometric data of a user, identifies a corresponding credential data of the user; determines which of the items in the user-specific information will be sent to the client device; and returns the determined items to the client device, and causes the client device to store the determined items as cache data used for logging into at least one of the client device and the target service, wherein the client device and the target server have given a login authority to the user.