An Untraceable Off-Line Electronic Cash Scheme without Merchant Frauds
Baoyuan Kang, Danhui Xu · International Journal of Hybrid Information Technology · 2016
In an electronic cash scheme, there are three participants, the bank, the spender and the merchant.First, a spender opens an account in a bank.Then, he withdraws electronic cash from his account and pays it to a merchant.After checking the electronic cash's validity, the merchant accepts it and deposits it to the bank.There are a number of requirements for an electronic cash scheme, such as, anonymity, unforgeability, unreusability, date attachability, divisibility, transferability and portability.In this paper, we show a recently proposed electronic cash scheme is suffering from some faults in anonymity, expiration date and merchant frauds.To improve the scheme, we propose a new untraceable off-line electronic cash scheme and give a security analysis for it.