A secure, anonymous and scalable digital cash system.
详细信息
文摘
Blind signatures make anonymity a reality in digital cash systems. However, when deployed in digital cash systems such as eCash, blind signatures raise such drawbacks as bad scalability and unfair anonymity. In this thesis, efforts have been done to combine digital signatures and a mechanism called “money-exchange” found in NetCash to build a new digital cash system. In the new system, two forms of digital cash are introduced: digital notes and digital coins. “Money-exchange” is extended to permit cash exchange from one form to the other. At the side of the digital cash issuer, at least two databases are maintained to detect double-spending. The new digital cash system is secure due to its deployment of both symmetric and asymmetric encryption algorithms. The combination of blind signatures and the extended money-exchange mechanism offers unconditional and fair anonymity, and it makes the system more scalable with the regards to the number of clients served.