Design And Implementation Of Anonymous Electronic Cash System Based On Blind Signature

The Internet has been widely implemented,which can not only enable us to engage in more work and entertainment,but also provide essential help for our lives,making our lives more convenient and efficient.The emergence of electronic cash has made it more convenient for us to use online transactions,but at the same time,it has also brought a variety of security issues and security risks.At present,the problems of user identity privacy and transaction data leakage in online transactions are becoming increasingly serious,which invade the privacy of individuals and have become one of the important issues in society.Digital signature technology is one of the key technologies of information security,which can ensure the integrity of information transmission,authenticate the identity of the sender and prevent the occurrence of denials in the transaction.Aiming at the above problems,this paper proposes an efficient,secure and highly executable blind signature scheme based on RSA,which can guarantee the anonymity of the identity of the messager.In addition,this paper combines blind signature with anonymous electronic cash system to form an anonymous electronic cash system based on blind signature to protect privacy of consumers and solve the problems of privacy leakage.According to these practical application requirements,the following aspects are included in this paper:(1)This paper proposes a new blind signature scheme based on RSA.The scheme uses the RSA algorithm to generate the public and private keys of the signer and the sender.The sender encrypts the message with his public key,and the signer receives the encrypted message,signs it blindly and returns it to the sender.The sender uses his private key to unblind the message,and verify the integrity of the message by verifying the validity of the signer's signature.This scheme realizes the process of the signer signing the message without being aware of the content of the message,that is,the blind signature process,which guarantees the anonymity of the identity information of the sender.After that,this paper analyzes the security and efficiency of the new blind signature scheme based on RSA and testifies the performance of the scheme,which indicates that the scheme has higher security and computational efficiency and proves the feasibility of the scheme.(2)This paper designs an electronic cash system,analyzes the system requirements of electronic cash system and realizes the functions of the system.Firstly,this paper designs the system model and plans the process of each phase,and then designs an anonymous electronic cash system based on the blind signature.The system realizes the anonymity of user identity and finally achieves the purpose of protecting user identity privacy.Secondly,the system realizes the various functions of the user and the administrator.The functions of the user include login,encryption,deposit,withdrawal,transfer,checking balance and checking transaction information,etc.The functions of the bank administratorinclude login,database recovery,and view of user account information etc.We have implemented all of the above features of the anonymous e-cash system by using Java Web technology and Spring MVC technology.Then,we have applied the blind signature scheme to the anonymous e-cash system to transfer the electronic cash of the user from the input address to another output address.The feature makes it impossible for offenders to trace the real address of the user,ensuring the privacy of the identity information of the user.Performance analysis shows that the anonymous electronic cash system in this paper can realize the security of anonymous transactions with a small communication cost and has good application prospects.