Aggregate signature schemes are particularly useful for authentication in resource-constrained wireless networks for realizing batch verification.Certificateless cryptosystems can resolve the certificate management problem or key escrow problem in aggregate signature schemes.This paper firstly analyzed a certificatelss aggregate signature(CLAS) scheme.Then
a more efficient CLAS scheme that requires less bilinear paring operations was provided.The security analysis showed that this scheme can resist the forgery attack under the random oracle model