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:
May. 19, 1998
Filed:
Dec. 22, 1995
Eric Sprunk, Carlsbad, CA (US);
Paul Moroney, Olivenhain, CA (US);
Brant Candelore, Escondido, CA (US);
General Instrument Corporation of Delaware, Chicago, IL (US);
Abstract
A method and apparatus are provided for generating a digital signature that authenticates information of a plurality of different information groups. Information from each group is hashed to produce a separate hash key for each group authenticating the information in that group. Particular combinations of the hash keys are hashed together to produce at least one combined hash key. Each of the hash keys is ultimately combined in a predetermined order with all other hash keys via the combined hash keys to produce the digital signature in a manner that authenticates the information of all of the information groups. The digital signature is reproducible without access to all of the information groups authenticated thereby. Instead, information from a first information group is provided together with a set of hash keys and combined hash keys embodying authenticated information from the other groups. The hash key for the first information group is produced locally and combined with the other hash keys and/or combined hash keys in order to reproduce the digital signature.