Research Of Efficiency Divisiable E-cash System

E-cash is becoming the main way of payment in the Electronic Commerce because of its high convenience, economic and efficiency. Increasing number of scientists in this field gave high concern on designing and realizing a divisible e-cash system of high efficiency, high security.Firstly, we gave some introduction of the background knowledge, research actuality at home and abroad and key technologies in e-cash system. Secondly, we analyzed the present e-cash system. after some betterment, we designed a new type of divisiable E-cash system. Besides, we brought up some new idea on theory and reaearch in the divisible e-cash system. Primarily, we spent our efforts on the following aspects:1)Via studying and analyzing the present E-cash systems, we found that double-spending and over-spending have become serious, in allusion to them, we designed a E-cash system based on smart card.Our system successfully avoided double-spending and over-spending by proventing. In this way, illegal operation can be restricted efficiently.2)A new divisible e-cash scheme is proposed aiming at solving low efficiency in divisible e-cash system,after analysing in non-trusted third party divisible e-cash systems.It reduced the system complexity and improves overall system efficiency by adding campact and batch payment.3)The length and key in the signature based on bilinear (BBS) are much shorter than any other signature, and the signature based on bilinear has a higher level of security. Therefore, a new type of divisible e-cash system based on BBS is proposed after adding campact and batch payment.It highly ensures the safety and efficiency of divisible e-cash system in high degree.Finally, we summarized some points in divisible e-cash system, point out problems in it, and prospects the future research of divisible e-cash system.