Abstract: An authentication system includes: a first terminal; a second terminal; and an authentication subsystem, wherein the first terminal transmits first identification information and a first request for push authentication to the authentication subsystem, the authentication subsystem matches the first identification information against second identification information stored in association with a unique ID of the second terminal, and if the second identification information matching the first identification information exists, transmits a push authentication operation start request to the second terminal based on the stored unique ID of the second terminal, and upon receiving the push authentication operation start request, the second terminal prompts a user to perform a predetermined operation other than inputting any of knowledge authentication information, ownership authentication information, and biometric authentication information, and when the predetermined operation is performed by the user, transmits a

Abstract: An authentication system includes first and second terminals, and an authentication subsystem. The authentication subsystem: generates a first token based on reception of a code image authentication start request, generates and stores a code image key in association with the first token, generates and stores a code image including the code image key at a URL of the storage unit, transmits the first token and the URL to the first terminal, registers the received first token as a key in an information transmitting and receiving unit, checks whether a received ID of the second terminal is a unique ID, when the received unique ID of the second terminal is the unique ID, checks whether the received code image key is stored in the storage unit, and transmits a first response code to the information transmitting and receiving unit using, as a key.

Abstract: An authentication system includes first and second terminals, and an authentication subsystem. The authentication subsystem: generates a first token based on reception of a code image authentication start request, generates and stores a code image key in association with the first token, generates and stores a code image including the code image key at a URL of the storage unit, transmits the first token and the URL to the first terminal, registers the received first token as a key in an information transmitting and receiving unit, checks whether a received ID of the second terminal is a unique ID, when the received unique ID of the second terminal is the unique ID, checks whether the received code image key is stored in the storage unit, and transmits a first response code to the information transmitting and receiving unit using, as a key.

Abstract: An authentication system includes: a first terminal; a second terminal; and an authentication subsystem, wherein the first terminal transmits first identification information and a first request for push authentication to the authentication subsystem, the authentication subsystem matches the first identification information against second identification information stored in association with a unique ID of the second terminal, and if the second identification information matching the first identification information exists, transmits a push authentication operation start request to the second terminal based on the stored unique ID of the second terminal, and upon receiving the push authentication operation start request, the second terminal prompts a user to perform a predetermined operation other than inputting any of knowledge authentication information, ownership authentication information, and biometric authentication information, and when the predetermined operation is performed by the user, transmits a