Patent ID: 7353396
Filing Date: 2008-04-01
Classification: G06Q,G07C,G07F,H04L

Abstract:
1. A method for an entity A to control the access of at least one user U to at least one disconnected door D having means to determine the current time, comprising the steps of: for each time interval d of a sequence of dates, having A produce a digital signature SIGUDd, indicating that user U can access door D during time interval d; causing a card of the user U to receive SIGUDd during time interval d for presentation to door D in order to pass through D; having U present the card with SIGUDd to door D; and having D open after verifying that (i) SIGUDd indeed is a digital signature of A indicating that U can access door D at time interval d, and (ii) that the current time is indeed within time interval d, wherein the door D stores, on the card of the user, information corresponding to an access attempt of a different user.