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:
May. 12, 2020
Filed:
Feb. 19, 2019
Apple Inc., Cupertino, CA (US);
Mitchell D. Adler, Los Gatos, CA (US);
Yannick L. Sierra, San Francisco, CA (US);
Ganesha A. G. Batta, Cupertino, CA (US);
Michael Giles, San Jose, CA (US);
Akshay M Srivatsa, Santa Clara, CA (US);
Craig P. Dooley, Los Gatos, CA (US);
Sriram Hariharan, San Jose, CA (US);
Robert D. Watson, Menlo Park, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Some embodiments provide a method for establishing a secured session with backward security between a first device and a second device. In some embodiments, the method establishes a communication session between the first and second devices using shared keys stored at the first and second devices. The method exchanges encrypted data between the first and second devices as a part of the communication session. The method, upon completion of the communication session, modifies the shared key at the first device in a predictable way. The shared key is modified at the second device in the same predictable way. The method then stores the modified shared key at the first device. The modified shared key cannot be used to decrypt any portion of the encrypted data of the current and previous communication sessions.