Comment on the improvement of an efficient ID-based RSA mutlisignature

Abstract

In 2008, Harn and Ren proposed an efficient identity-based RSA multisignatures scheme which it based on Shamir's identity-based signature. In 2010, Yang et al. pointed out two methods that he presumed make the Harn-Ren scheme insecure. This documentation will prove that Yang et al.s first forgery attack was incorrect and the Harn-Ren scheme is still secure. © 2011 Springer-Verlag.