In a public key cryptosystem, an important problem is how to revoke a user. As we know, the certificateless public key cryptography (CLPKC) unites the qualities of the traditional public key system and the identity-based public key system. It is free of complicated certificate management and key escrow. However, there are few solutions to the revocation problem in CLPKC. In this paper, we present an efficient revocable certificateless signature scheme. Moreover, this new scheme is free of bilinear pairing. Under the assumption of Discrete Logarithm problem, our scheme is provably secure.
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