Key-escrow free multi-signature scheme using bilinear pairings

Abstract

We present a multi-signature scheme based on bilinear pairings. The scheme is key escrow-free and does not require any secure channel for private key issuance to users. We use a binding-blinding technique to avoid the key escrow problem and to eliminate a secure channel requirement for the key issuance stage. The basic scheme is extended to sequential and parallel multi-signature schemes. We show that the basic scheme and multi-signature schemes are secure against adaptive chosen message attacks under standard assumptions.