Specified The Research And Implementation Of Multi-receiver Signature

With the rapid development of Internet, the theory and technology of information security become more and more important. The digital signature is the foundation and guarantee of the information security and plays a key role in protecting the security of networking communication.In practical application, there are various demands to the use of digital signature. In some situation a message needs to be sent to more than one legal recipient at the same time. A signer expects his signature to be validated only by these appointed recipients. Every receiver also hopes he can easily verify the signature respectively without any others' help, but those irrelevant ones can not without the signer's or his cooperation. This kind of special digital signature is appointed multi-receiver signature.However, at present the systemic study about appointed multi-receiver signature technology has not been seriously considered. So, we mainly discuss the kind of special signature in detail in this thesis. Based on the analysis and summarization to some existing related digital signatures, three kinds of appointed multi-receiver signature schemes using Tate pairing are proposed and their applicabilities are also proved respectively by us. Our study shows the three schemes are secure, efficient and each has its strong point. In addition, a practical and efficient method to achieve fast computation of Tate pairing is provided in order to guarantee the appointed multi-receiver signature efficiency.The main achievements contained in this dissertation are as follows:(1) Chameleon signature becomes complex and inefficient if there are more than one recipient. Aiming at the flaw, an appointed multi-receiver Chameleon signature scheme is proposed that is advantageous in protecting the interests of the signer. No matter how many appointed receivers, the signer can conveniently control the verification of the signature only by computing the sum of all recipients' public keys at one time. The design and implementation of the scheme is simple and very efficient. Furthermore, the signature is very short and will not be lengthened even with the increase in number of the appointed recipients.(2) An improved appointed multi-receiver Chameleon signature scheme with time limit is presented based on the appointed multi-receiver Chameleon signature scheme. Its signature efficiency and security are better than the existing convertible Chameleon signature schemes'. A good way to solve the problem of signature with appointed receivers and time limit is offered by the scheme.