Research And Implement Of Key Technologies Of Electronic Money On Android

Most of the existing electronic cash trading system must involve online bank, which will become communication bottlenecks, and have influence on trading efficiency. Therefore offline point-2-point trading model will be a tendency of financial services, and recently, the fast rising NFC technology offers facility for this model.This thesis designs and implements an offline point-2-point electronic trading system based on NFC technology on Android Platform. Meanwhile, this thesis studies the security of electronic cash trading system, and implements a security mechanism which adapts to the offline point-2-point electronic cash trading system.The main contributes of this thesis are as follows.1. An auditing program depends on the arbitrators for forbidding reuse is designed. The scheme with partially restrictive blind signature can effectively control the risk of reuse.2. Implement a security mechanism adapt to offline point-2-point electronic trading system by using security domain in SIM card, DES and blind signature. This security mechanism can ensure the security of trading offline.Finally, this thesis use Decorator Pattern, Singlet Pattern, Composite Pattern, Java mapping technique and configuration file technique to implement the client App of the offline point-2-point electronic cash trading system. This system has good extensibility and good iterative by using Decorator Pattern. The testing shows that the system can work securely.