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. 14, 2026
Filed:
Sep. 28, 2020
Cryptography Research, Inc., San Jose, CA (US);
Scott C. Best, Palo Alto, CA (US);
Joel Wittenauer, Pleasanton, CA (US);
Cryptography Research, Inc., San Jose, CA (US);
Abstract
Multiple helper data solutions (a.k.a., helper data blocks), and therefore multiple possible PUF output values, are generated for a given integrated circuit die. These helper data blocks are encrypted and stored in a nonvolatile memory on the integrated circuit die. Each helper data block is encrypted such that each helper data block can only be decrypted by a decryption key that is different from the other encrypted helper data blocks stored on that integrated circuit die. The keys to decrypt the multiple helper data blocks are released one at a time and spread over time. Because the helper data is encrypted, each PUF output value is only discoverable when its associated key is released. Accordingly, counterfeit systems or integrated circuits will need to be re-reverse engineered each time a new key is released.