Secure and Efficient Identity-based Aggregate Signature Scheme

An aggregate signature scheme is a digital signature that given n signatures on n distinct messages from n distinct users,it is possible to aggregate all these signatures into a single signature.We proposed an identity-based aggregate signature scheme based on the bilinear pairings,which has a lower verification cost compared with the existing identity-based aggregate signatures.We proved that the proposed signature scheme is secure against existential forgery under adaptively chosen message and ID attack in the random oracle model,assuming that the Computational Diffie-Hellman problem is hard to solve.