Information processing system, information processing method, authentication system, and program

Abstract

An information processing device intended to effectively improve the reliability of an authentication process, including: an authentication information acquisition circuit acquiring authentication information; and a code update circuit updating an authentication code readable from the outside or transmittable to the outside for each predetermined cycle, on the basis of the authentication information acquired by the authentication information acquisition circuit, and time information changed in an update cycle shorter than or equal to the predetermined cycle. The predetermined cycle may preferably be 1 second or shorter. In addition, the authentication information acquisition circuit may preferably acquire the authentication information from an external server in the form of a one-time token including a first expiration date with a first length.