The Research Of Electronic Cash Payments System And Its Key Techniques

With the development of electronic commerce, electronic cash has become an unsubstitutable means because of the particular function protecting the payer and the payee's privacy. Consumer with e-cash can be anonymous shopping by internet as convenience as currency and credit card, and ensure other people will not know consumer's identity.First, the paper gives an overview on the history of e-cash system and the use of cryptography in e-cash. Based on analyzing the most practical eCash? e-cash system at present, three problems are given.After that, using Jules's trustee-based tracing mechanism, an off-line E-cash system with controllable anonymity is designed based on trust third party.At last, Analysis has also been conducted upon the new e-cash system security and the scheme is certified to be feasible through carrying out the system model.In our e-cash system, the withdrawal date and expiry date, prescribed by user are embedded in e-cash.The bank only needs to keep all used and undue e-cash in their database to trace the double-spender. It reduces the storage level and improves the querying efficiency of the bank to detect double-spending. The system can ensure anyone who somehow observes e-cash can not spend them.The system can also meet off-line and conditional anonymity. An off-line E-cash system with controllable anonymity accords with people's consuming habit much more, fits the development of e-commerce much more.