对Brands电子现金方案的一种改进

An Improvement to Brands E-cash Scheme

电子现金支付系统是电子商务发展的关键,目前出现的电子现金方案在银行发行多种面值的电子现金时都是使用最直接的方法:即银行选择不同的私钥和公钥对来发行不同面值的电子现金,从而导致银行需要对多个私钥进行保密。利用限制性盲签名的特点,提出了一种基于Brands离线电子现金方案的高效的多种面值电子现金方案,银行只用保密一个私钥即可发行不同面额的电子现金,从而提高银行以及整个系统的安全和效率。

It is suggested that the bank just directly use different private and public key pairs to issue different denominations cash in previous e_cash schemes.An efficient multi_denomination off_line e_cash scheme is presented, in which the bank only needs one private key other than n different private keys when issuing n kinds denominations e_cash. The new scheme is more efficient than previous multi_denomination schemes.