Patent ID: 6690794
Filing Date: 2004-02-10
Classification: H04L

Abstract:
An electronic ticket system comprising a ticket issuing device, a verification device and a proving device, wherein said ticket issuing device comprises:ticket characteristic information hold means for holding at least ticket public information and ticket secret information; proving device unique identifying information hold means for holding proving device unique identifying information; proving device identifying information hold means for holding proving device identifying information in association with said proving device unique identifying information; and ticket issuing means for creating a ticket made of digital information by combining at least said ticket secret information and said proving device unique identifying information; wherein said verification device comprises: authenticating information generating means for generating a value used in an interactive proof; and interactive verification means for verifying interactively whether said proving device has calculated said ticket secret information, and wherein said proving device comprises: proving device unique identifying information hold means; ticket hold means; and interactive proof means for proving interactively knowledge about said ticket secret information on the basis of at least said proving device unique identifying information and said ticket.