Blind subpoena protection

US12393720B2 · kind B2 · utility

Assignee

• MICROSOFT TECHNOLOGY LICENSING, LLC · US

Inventors

• Ramarathnam Venkatesan · Redmond, US
• Nishanth Chandran · Bengaluru, IN
• Panagiotis Antonopoulos · Redmond, US
• Srinath T.V. SETTY · Redmond, US
• Basil CHERIAN · Bellevue, US
• Daniel John CARROLL, JR. · Columbia, US
• Jason Sydney BARNWELL · Seattle, US

Key dates

• Filing date: Oct 7, 2022
• Grant date: Aug 19, 2025
• Expiry date: Jun 30, 2043

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L63/20
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

Embodiments described herein enable at least one of a plurality of entities to access data protected by a security policy in response to validating respective digital access requests from the entities. The respective digital access requests are received, each comprising a proof. For each request, an encrypted secret share is obtained from a respective ledger database. Each request is validated based at least on the respective encrypted secret share and the proof, without decrypting the respective encrypted secret share. In response to validating all of the requests, a verification that an access criteria of a security policy is met is made. If so, at least one of the entities is provided with access to data protected by the security policy. In an aspect, embodiments enable a blind subpoena to be performed. In another aspect, embodiments enable the at least one entity to access the data for an isolated purpose.