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:
Jul. 29, 2014
Filed:
Mar. 15, 2012
Scott Alexander Vanstone, Campbellville, CA;
Robert Gallant, Corner Brook, CA;
Robert J. Lambert, Mississauga, CA;
Leon A. Pintsov, West Hartford, CT (US);
Frederick W. Ryan, Jr., Oxford, CT (US);
Ari Singer, Hamden, CT (US);
Scott Alexander Vanstone, Campbellville, CA;
Robert Gallant, Corner Brook, CA;
Robert J. Lambert, Mississauga, CA;
Leon A. Pintsov, West Hartford, CT (US);
Frederick W. Ryan, Jr., Oxford, CT (US);
Ari Singer, Hamden, CT (US);
Certicom Corp., Mississauga, CA;
Pitney Bowes Inc., Stamford, CT (US);
Abstract
A signature scheme is provided in which a message is divided in to a first portion which is hidden and is recovered during verification, and a second portion which is visible and is required as input to the verification algorithm. A first signature component is generated by encrypting the first portion alone. An intermediate component is formed by combining the first component and the visible portion and cryptographically hashing them. A second signature component is then formed using the intermediate component and the signature comprises the first and second components with the visible portion. A verification of the signature combines a first component derived only from the hidden portion of the message with the visible portion and produces a hash of the combination.