Systems and methods for identity-based encryption and related cryptographic techniques

US9356779B2 · kind B2 · utility

Assignees

• The Board of Trustees of the Leland Stanford Junior University · US
• The Regents of the University of California · US

Inventors

• Dan Boneh · Palo Alto, US
• Matthew Franklin · Palo Alto, US

Key dates

• Filing date: Feb 8, 2012
• Grant date: May 31, 2016
• Expiry date: May 15, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L2209/04
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A method and system for encrypting a first piece of information M to be sent by a sender [100] to a receiver [110] allows both sender and receiver to compute a secret message key using identity-based information and a bilinear map. The sender uses a bilinear map to encrypt a message M, producing ciphertext V to be sent from the sender [100] to the receiver [110]. The receiver [110] uses the bilinear map to decrypt V and recover the original message M. According to one embodiment, the bilinear map is based on a Weil pairing or a Tate pairing defined on a subgroup of an elliptic curve. Also described are several applications of the techniques, including key revocation, credential management, and return receipt notification.