Research Of Forward Secure Proxy Signature Scheme With Designated Verifier

With the development of computer and internet technologies,the relation between people's life and information security becomes more and more closely.Application of information security technologies has become increasingly widespread and penetrated into all aspects of life.As the e-commerce,e-government,online banking and online shopping platform have become the mainstream of society,the status of network information security has become increasingly important.Digital signature is a key technology of information security.It realizes secure trade in electronic commerce and preserves data security in government affair.Digital signature technology is important guarantee of network security,plays a significant role in ensuring message integrity,identifying the source of the message,authentication of electronic transactions and non-repudiation.In electronic voting,electronic payment and other important occasions,in order to ensure the validity and anonymity of each message in different application background,we need to study the corresponding digital signatures for special purposes.Through the analysis of a forward secure threshold proxy signature scheme with designated verifier,it shows that even valid proxy signature could not be verified,because the scheme's signature verification equation is wrong,and the scheme does not have the feature of anonymity.Analyzing a certificateless multi-designated verifiers proxy signature scheme,we know that it exists public key replacement attack and error in using bilinear pairings.This article bases on bilinear pairings and discrete logarithm problem to study forward secure signature scheme with designated verifier.The main results are as follows:(1)This article analyzes the development characteristics of forward secure signature scheme with designated verifier,and briefly introduces basical knowledge.(2)Through analyzing a forward secure threshold proxy signature scheme with designated verifier,it shows that even valid proxy signature could not be verified,because the scheme's signature verification equation is wrong,and the scheme does not have the feature of anonymity.In order to overcome these disadvantages,an improved forward secure threshold proxy signature scheme is proposed.By updating the partial keys to achieve success in updating the collection members' signing secret key,which makes it nearly impossible thatsingle member is expected to control the updating of the signing secret key.The new scheme has the feature of verifiability as well as anonymity.This scheme has more advantages than those schemes discussed.(3)After analyzing a certificateless designated multi-verifiers proxy signature scheme,a certificateless forward secure designated verifier proxy signature scheme is proposed,which bases on bilinear pairing and elliptic curve discrete logarithm problem.The correctness,security and performance of the scheme are analyzed and compared in detail.