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:
Sep. 07, 2010
Filed:
Feb. 10, 2006
Philippe Golle, San Francisco, CA (US);
Eric J Shrader, Belmont, CA (US);
David Goldberg, Palo Alto, CA (US);
Philippe Golle, San Francisco, CA (US);
Eric J Shrader, Belmont, CA (US);
David Goldberg, Palo Alto, CA (US);
Palo Alto Research Center Incorporated, Palo Alto, CA (US);
Abstract
An XOR (exclusive or) encoded document is disclosed for establishing a joint secret between two parties. Encoded on the document are one or more areas of XOR messages. Each area containing an XOR message hides from view on each side of the XOR encoded document a different message on either side of a transparent base layer. To uncover a message in an area containing an XOR message on one side of the transparent base layer, the message on the other side of the XOR encoded document is scratched off and rendered illegible.