Privacy-preserving online transaction scheme based on El Gamal signature
Bo Yang · Jisuanji yingyong yanjiu · 2014
The users' privacy should be protected in online transactions. In view of this,according to the oblivious transfer,this paper proposed an online trading scheme of digital goods to protect the users' privacy using oblivious signature-based envelope( OSBE) based on El Gamal signature. First,a user paid the bank anonymously and correctly; the bank sent a digital signature of the digital goods to the user; and then the user interacted with the merchant obliviously through the digital signature he has paid; finally,the user could and only could get the digital goods he paid,and the merchant couldn't distinguish the digital goods ordered. Correctness proof and security analysis shows that the scheme can effectively protect the users' privacy in online transactions and prevent the merchant's malicious fraud. The signature scheme is relatively short,less amount of calculation and the key dynamic change,security is stronger.