基于身份的盲签名在移动电子支付中的应用

Identity-Based Blind Signature Scheme for Mobile Electronic Payment

目前可行的基于身份数字签名方案大都是基于Weil Pairing或Tate Pairing实现的,而这两种实现体制的时间复杂度均比较高,不适于移动网络环境.针对上述问题,提出了一个基于身份的数字签名方案,在该方案中,KGC无法获得用户的身份和私钥,保护了用户的隐私性.文中在此基础上又提出了一个基于身份的盲签名方案.以上两种方案都是以椭圆曲线离散对数问题为基础,时间复杂度低、签名结果短,因此更适于移动网络环境.最后利用以上两种签名方案构造了一个轻便可分的电子支付方案,其计算量小,所需存储量少,网络传输流量较低,上述特点使其更适于移动网络环境.

Up to today, most of the identity-based signature schemes are implemented with Weil Pairing or Tate Pairing, while the time complexity of these two mechanisms is a little high, so the signature schemes are not fit for mobile network environment. As a result, a new identity-based signature scheme is put forward in this paper, in which, during the course of key extract, the KGC cannot get the user＇s ID and private key, so the user＇s privacy is protected. Then an identity-based blind signature scheme is followed. The above two schemes are all based on Elliptic Curve Discrete Logarithm Problem, whose time complexity is low, signature result is short, so it＇s suit for mobile network environment. Finally, an efficient and divisible electronic payment scheme is presented under the above two signature schemes, whose computational load, storage needed and network load are all light, so it is fit for mobile commerce.