A Secure and Efficient Certificateless Signature Scheme in the Standard Model

Certificateless public key cryptography is an attractive paradigm which combines advantages of both traditional public key cryptography and identity-based cryptography because it avoids using certificates and does not suffer from key escrow. In this paper, the author proposed a certificateless signature (CLS) scheme built upon bilinear pairings and proved its security in the standard model. The scheme turns out to be more efficient than other proposed CLS schemes in the standard model, and the signing algorithm needs no pairing operation while the reverse operation requires only three pairing computations.