Self-certified Signcryption Scheme with Proxy Re-encryption Property

By analyzing Yu Huifang's self-certified signcryption scheme,this paper finds that the proxy can recover the private key of the original signcryptor,and proposes a self-certified signcryption scheme with the character of proxy re-encryption based on bilinear mapping.It makes use of a semi-trusted proxy to realize the transparent conversion between the different de-signcryptor's identities of the signcryption on the same plaintext.Compared with another scheme,the scheme proposed can eliminate the certification management in the traditional public key cryptosystem and the key-escrow in the identity-based system,and it has advantages of high security,short key,low computing complexity and communication costs.