The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 2004
Filed:
Mar. 30, 1999
Robert A Cordery, Danbury, CT (US);
Bitney Bowes, Inc., Stamford, CT (US);
Abstract
A method for certification by a plurality of certifying authorities of the public key of a user wishing to communicate using a public key encryption system while asserting only a subset of rights. A plurality of certifying stations and a user station exchange information and the user station derives a plurality of private keys from the exchanged information. The certifying stations also publish related information and their public keys. The user communicates using a private key formed by summing selected ones of said plurality of private keys corresponding to asserted rights. A third party can derive the public key corresponding to the user's summed private key by operating on the published information with a summation of the certifying station public keys.