Multisignature Research

Digital Signature is the main research content in modem cryptography. It is an important identity authentication technology, it gives an assurance that people can carry out their digital office convenience in the Internet age. It is applied in wide field such as information security, identity authentication data integrality, undeniableness and anonymity.With the development of the computer technology and network communication technology as well as the diversity and complexity of computer and network applications, digital signature has developed from single signature and single validate to multi-signature and validate which has greatly expanded the use of digital signature. So, digital signature technology is more widely used in electronic contracts, the signing of documents, wills signed, e-commerce and e-government and other fields.Firstly, this paper introduces the background and significance of multi-signature, then, I have studied and introduced digital signatures and multi-signature, and detailed research and analysis of the development and current status of multiple digital signatures, and in-depth analysis of several Public-key crypto-system. On the basis of the research of those theory mentioned above, the paper some work as follow:1、Merging Okamoto signature and broadcasting multi-signature, we propose a new Okamoto type broadcasting multi-signature scheme based on DLP is presented, and proved the security and correctness of the new version of the scheme.2、Add in the Okamoto type broadcasting multi-signature scheme (certificate type) based on the characteristics of the proxy signature, to construct a new multi-proxy signature scheme, and proved the security and correctness of the new version of the scheme.3、Merging MLR signature and sequential multi-signature, we propose a new MLR type sequential multi-signature scheme based on DLP is presented, and proved the security and correctness of the new version of the scheme.4、Merging ECMLR signature and sequential multi-signature, we propose a new MLR type sequential multi-signature scheme based on ECDLP is presented, and proved the security and correctness of the new version of the scheme.