Abstract: For the problem of low efficiency of the existing content extraction signature scheme,based on the certificateless public key cryptography and using the scalar multiplication over elliptic curve group to replace the pairing,this paper proposed an efficient content extraction signature without pairing．The proposed scheme is proved existentially unforgeable under adaptive chosen-message attacks assuming in the random oracle model．Compared with known schemes built from pairings,our schemes are more efficiency and practicality.

Key words: Bilinear pairings,Certificateless public key cryptography,Content extraction signature,Discrete logarithm problem,Random oracle model