The Research Of Identity-based Digital Multi-signature

Digital signature is an importent identity authentication technology, it gives a assurance that people can carry out their digital office convenience in the Internet age. With the development of the computer technology and Internet technology, digital signature has developed from single signature to multi-signature which has greatly expanded the use of digital signature.So, digital signature technology is more widely used in digital office. Digital Multi-signature technology makes the procedures of modern office digitization,so that the office is fast,simple,safe andconvenient, and it is widely used in electronic contracts,the signing of documents,e-commerce and e-government and other fields.Firstly, this paper introduces the background and significance of identity-based multi-signature,then,I have studied and introduced identity-based cryptography,digital signatures, multi-signature, identity-based multi-signature,and the paper has analysed the typical algothms and systems of those theories and techniques detailedly, the paper has analysed the security of a multi-signature system based on RSA deeply so that I have found some drawbacks of it.Accoring to another paper,these drawbacks have been analyzed and modified,and I have proved that the modified algorithm is security.On the basis of the research of those theory mentioned above, the paper has put forward a new identity-based digital multi-signature system, and has demonstrated the simplicity,effectiveness,security of the new system,finally,I have summarized the woek of the paper, and have put forward my ideas of the further work.