New identity-based proxy re-signcryption
Shaohui Liu · Journal of Computer Applications · 2011
A new identity-based proxy re-signcryption scheme was put forward on the basis of the signcryption with proxy re-encryption proposed by Chandrasekar S(CHANDRASEKAR S,AMBIKA K,RANGAN P C.Signcryption with proxy re-encryption.http://eprint.iacr.org/2008/276).The new scheme achieves a transparent conversion from one identity-based signcryption to another identity-based signcryption by using a semi-trusted proxy.And it realizes the complete conversion of signcryption,that is,it concurrently achieves the conversion of both confidentiality and verification.In the same time,it realizes the full public verifiability of the signcryption without the direct participation of the plaintext.Based on the Computation Bilinear Diffie-Hellman(CBDH) problem,it is proved to be IND-CCA2 secure in the Random Oracle Model(ROM).Through the analysis of its efficiency and function,the scheme resolves the problems of both failing to realize the conversion of the verification and the verifiability of signcryption needing the participation of plaintext in the scheme advanced by Chandrasekar S.