Efficient ID-based Designated Verifier Signature
Olivier Blazy, Emmanuel Conchon, Paul Germouty, Amandine Jambert · 2017
The concept of undeniable signatures has been introduced at Crypto'89 by Chaum and van Antwerpen. It has been revisited several times since, in particular by Jakobsson, Sako and Impagliazzo at Eurocrypt'96 who introduced designated verifier signatures and by Steinfeld, Bull, Wang and Pieprzyk at Asiacrypt'03 who designed universal designated verifier signatures. Behind all those notions lies the idea to produce some kind of signature that can be verified only by a targeted verifier. However the verifier should not be able to convince anyone that the signature is valid. In this paper, we present an efficient way to solve those three problems, under classical assumptions, namely DLin and CDH in the standard model. Once we propose such construction, we generalize our approach to a framework showing how to build efficient ID-based Designated Verifier Signature, in the standard model under classical assumptions.