Proxy Re-Signature Scheme from CBS to IBS

Abstract

In 1998, Blaze, Bleumer and Strauss proposed a new kind of cryptographic primitive called proxy re-signature. In proxy re-signature, a proxy can transform a signature computed under Alice’s secret key into one that can be verified by Bob’s public key. In 2005, Ateniese et al proposed a few re-signature schemes and also discussed its several potential applications. In this paper, we propose the first proxy re-signature scheme from certificate based signature (CBS) to identity based signature (IBS) with the help of PKG.