Comment on Wu et al.'s Server-aided Verification Signature Schemes

In ProvSec 2008, Wu et al. constructed two server-aided verification signature (SAV-Σ) schemes based on BLS signature. In this paper, we provide a new definition of the security of SAV-Σ against collusion and adaptive chosen message attacks. We founded that Wu et al.’s first scheme is secure, while their second scheme is insecure based on our definition.

[1]  Yong Tang,et al.  An Efficient Certificateless Signature from Pairings , 2007, The First International Symposium on Data, Privacy, and E-Commerce (ISDPE 2007).

[2]  Yi Mu,et al.  Server-Aided Verification Signatures: Definitions and New Constructions , 2008, ProvSec.

[3]  M. De Soete,et al.  Speeding up smart card RSA computations with insecure coprocessors , 1991 .

[4]  Yi Mu,et al.  Identity-based Universal Designated Verifier Signature Proof System , 2009, Int. J. Netw. Secur..

[5]  Bin Wang,et al.  A Forward-Secure User Authentication Scheme with Smart Cards , 2006, Int. J. Netw. Secur..