The Study of the Secure Electronic Cash Systems with Optional-Traceability and Recoverability

• Main Author: 馮建彰
• Other Authors: 王智弘
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/03397644675833464120

碩士 === 國立嘉義大學 === 資訊工程學系研究所 === 95 === In this thesis we proposed three electronic cash schemes. Theses schemes are based on the following concepts: (1) provide more services on the electronic cash scheme; (2) protect user’s privacy; (3) increase the security of usage of the electronic cash. In the first part, we proposed a flexible scheme; that is, the users can use the untraceable electronic cash and keep their traceability and anonymity. Otherwise the user can use the traceable electronic cash to pay the bill or even make a donation. It can add more properties on the electronic cash scheme and lets the user pay the bills of utilizing electronic cash. In the second part, we improve the first part and proposed a different scheme. This scheme can be integrated with other electronic cash systems and more practical. In the third part, we proposed a recoverable electronic cash scheme with forward secrecy. This scheme can provide not only a secure electronic cash protocol but also a recovery mechanism for lost electronic cash. In the recovery procedure, the untraceability and forward secrecy can be achieved. The proposed scheme can be applied to the different kinds of the electronic cash systems to provide better service.