Research On Special Digital Signature Scheme Based On The Bilinear Pairing

As the Internet is developing fast and with the widely application of WWW techniques, the information age comes. For sending or obtaining information, the network brings great convenience to users. But due to system leak and using illegal methods, the security and integrality of data has been damaged or extremely threatened. Thus information security is one of the most important problems in modern information society.Digital Signature, which can prove authentication, integrity and non-respudiation, is one of the main techniques of information security plays a very important role in the computer network. As the deepening application of Digital Signature in the fields of military and E-Business, the common digital signature can't still adapte to the special needs in practice. Thus, making research on the digital signatures with special properties becomes a main research direction in digital signatureFirst, this paper analysed and summarized the existing special digital signature scheme. After studing many documents, I found that the existing special digital signature all based on the difficulty of discrete logarithm or improved RSA. There have more or less problems in the scheme. Because of these problems, I put forward a threshold signature scheme and a threshold group signature scheme based on bilinear pairing. These scheme meet all the requirements of a good threshold group signature. Last, to meet the requirement of E-cash system, we put forward a scheme combining the threshold signature and blind signature. As the efficiency and safety of bilinear pairing in practice, it will be apply to a deeper special digital signature research. The next step we will research all kinds of signatures based on the bilinear pairing. Furthermore, we will research forward-secure property and apply it to digital signature and make a strong forward-secure signature. Finally, we prove that the scheme is safe and efficient.