Physical access control
First Claim
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.
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Accused Products
Abstract
A system and method are disclosed for controlling physical access through a digital certificate validation process that works with standard certificate formats and that enables a certifying authority (CA) to prove the validity status of each certificate C at any time interval (e.g., every day, hour, or minute) starting with C'"'"'s issue date, D1. C'"'"'s time granularity may be specified within the certificate itself, unless it is the same for all certificates. For example, all certificates may have a one-day granularity with each certificate expires 365 days after issuance. Given certain initial inputs provided by the CA, a one-way hash function is utilized to compute values of a specified byte size that are included on the digital certificate and to compute other values that are kept secret and used in the validation process.
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Citations
14 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling the access to at least one disconnected door, comprising:
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for each time interval of a sequence of dates, causing an entity to produce a digital signature, wherein the digital signature indicates that at least one user can access the disconnected door during the time interval; causing a card of a first user to receive the digital signature during the time interval for presentation to the disconnected door in order to pass through the disconnected door; and after the first user presents the card with the digital signature to the disconnected door, causing the disconnected door to open after verifying that;
(i) the digital signature is a digital signature of the entity indicating that the first user can access the disconnected door at the time interval, and (ii) that a current time is within the time interval, wherein the disconnected door stores, on the card of the first user, information that corresponds to a second user different from the first user. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification