Research On Improved Certificateless Signature Scheme And Its Application In Bill Management

With the rapid development of Internet technology,the information level of bill management is gradually improved.Bill information as a high privacy trading certificate,its security is facing a huge test.The certificateless short signature has the advantages of short signature length,no certificate management and key escrow,easy to store and transmit.It is suitable for mobile payment,electronic commerce and so on.It can effectively solve the security problems of bill information.Based on the short signature,this paper analyzes and studies the certificateless signature.The specific research contents are as follows:1.In order to solve the problem of public key replacement attack in traditional certificateless signature schemes and improve the security of traditional certificateless signature,a new adversary and security model is constructed by improving the definition of traditional certificateless signature.Based on this,an efficient certificateless short signature scheme is proposed,and the security of the scheme is proved under the assumption of random oracle model and Inv-CDH problem.Finally,the efficiency of the scheme is compared with that of other similar schemes,and the PBC library developed by Boneh team is used to realize the scheme.2.In order to satisfy the higher requirement of security protection in the management of bills nowadays,a bill payment system is constructed,the whole structure of the system is given,and the operating principle of the system is expounded in detail.Then,based on the certificateless short signature scheme,a secure interactive protocol is designed,which is suitable for the system.The security interaction protocol is used to protect the bill information in the system.