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:
Apr. 16, 2019
Filed:
Jun. 23, 2017
Microsoft Technology Licensing, Llc, Redmond, WA (US);
Srinath Tumkur Venkatacha Setty, Redmond, WA (US);
Ramarathnam Venkatesan, Redmond, WA (US);
Brant Lee Zwiefel, Mill Creek, WA (US);
Nishanth Chandran, Bangalore, IN;
Satyanarayana V. Lokam, Bangalore, IN;
Jonathan David Lee, Berkeley, CA (US);
Sharmila Deva Selvis, Chennai, IN;
Microsoft Technology Licensing, LLC, Redmond, WA (US);
Abstract
A device establishes a key recovery policy and generates a key that is protected based on the key recovery policy. The key recovery policy indicates which combinations of other entities can recover the protected key. The device generates different shares of the protected key, each share being a value that, in combination with the other share(s), allows the protected key to be recovered. Each share is associated with a particular leaf agent, the device encrypts each share with the public key of the leaf agent associated with the share and provides the encrypted share to a service. When recovery of the protected key is desired, a recovering authority can generate the protected key only if the recovering authority receives decrypted shares from a sufficient one or combination of leaf agents as indicated by the recovery policy.