Design And Analysis Of Designated Verifier Signature Scheme

Besides the decryption and encryption of the information, modern cryptography identifies the information sources, ensures the integrity and provides other fuctions such as non-repudiating of information. These functions could be realized through digital signature. In the general digital signature scheme, anyone can verify the validity of the signature, but sometimes the signer wants to protect their privacy, don’t want anyone to verify the validity of the signature. For this kind of situation, the designated verifier signature arises at the historic moment. In the 1996’s European cryptography conference, Jakobsson Sako and Impagliazzo first proposed the concept of designated verifier signature (DVS). Designated Verifier signature is a process in which the verifier specified by the signer in the signature verification stage who can only verify the alidity of the signature while any other people can not.Firstly, this paper introduces the designated signature’s background and significance; secondly, this paper introduces mathematics knowledge on digital signature; thirdly, this paper introduces the basic content of the designated signature; and then, this paper firstly propose a novel identity-based strong designated verifier signature scheme based on bilinear pairing and proved that the scheme is existentially against adaptive chosen message attack. Through the analysis of the computational cost, results show that the scheme has high efficiency. And then this paper analyses the scheme that is a new identity-based designated signature scheme with message recovery proposed by MinLin et al, and points out the the scheme cannot resist delegatable attacks, and then improved their scheme and gives security analysis for the improved scheme; finally, this paper improved an ID-based multi-signer universal designated multi-verifier signature scheme based on bilinear pairings which is proposed by TY Chang, and point out the scheme cannot resist delegatable attacks. The improved scheme overcomes the safety defects of TY Chang scheme and is non-delegatable.