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:
Jun. 28, 2022
Filed:
Nov. 29, 2017
Amazon Technologies, Inc., Seattle, WA (US);
Atul Khare, Sammamish, WA (US);
Amazon Technologies, Inc., Seattle, WA (US);
Abstract
Disclosed systems and methods implement a tracking system that tracks accesses to a TPM-secured key. In embodiments, the key may be encrypted using an encryption key, which is sealed using the TPM. A first value indicating an initial access state of the key is stored in a PCR of the TPM, and the encryption key is sealed against the PCR, so that it can be unsealed when contents of PCR match a next value derived from the first value. When the key is accessed, contents of the PCR is verified against an expected access state. If successfully verified, the PCR is extended hold the next value, the encryption key is unsealed, and the key decrypted. With each access, the encryption key is repeatedly resealed against the successive states stored in PCR. In this manner, the PCR may be used to track accesses and detect unauthorized accesses to the key.