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:
Aug. 26, 2014
Filed:
Sep. 12, 2011
Simon Wai Leong Leet, Redmond, WA (US);
Sarjana Bharat Sheth, Redmond, WA (US);
Patrick T. O'brien, Jr., Bellevue, WA (US);
Jack R. Davis, Woodinville, WA (US);
Simon Wai Leong Leet, Redmond, WA (US);
Sarjana Bharat Sheth, Redmond, WA (US);
Patrick T. O'Brien, Jr., Bellevue, WA (US);
Jack R. Davis, Woodinville, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
The objects of an archive may be verified with a cryptographic signature stored in the archive. However, when an object is extracted, the authentication involves re-authenticating the entire archive, re-extracting the object, and comparing the extracted object with the current object, which is inefficient or unachievable if the archive is unavailable. Instead, the archive may include a block map signed with the signature and comprising hashcodes for respective blocks of the objects of the archive. When an object is extracted, the signature and block map may also be extracted and stored as objects outside of the archive. The extracted signature and block map may later be verified by authenticating the signature, verifying the block map with the signature, and matching the hashcodes of the block map with those of the blocks of the extracted objects, thus enabling a more efficient and portable verification of extracted object with extracted authentication credentials.