Anonymity revocable divisible e cash system
CHEN Kai,HU Yu pu,XIAO Guo zhen (Research Inst. of Information and Privacy, Xidian Univ., Xi′an 710071, China)
An anonymity revocable divisible e cash system is firstly presented with the introduction of a Trustee. A very simple method instead of Okamotos complex binary tree presentation technique is used to construct a divisible e cash system, thus making the system not only efficient but also preventing crimes by using the anonymity of a coin. Since a coin can be spent legally several times, there is no double spending but over spending. In the system, the trustee is off line entirely, and does not need to be involved in any protocol expect the owner/coin tracing and over spending check protocols.