A protocol for fair electronic purchase based on concurrent signatures

E-commerce protocols for the electronic purchase of goods are difficult to design and implement due to their complexity and high security demands. Fairness of such protocols in literature highly depends on an additional TTP（trusted third party）. However, it is difficult to find such a TTP in some situations. In addition, fairness for customers has been neither fully considered nor well satisfied in existing electronic purchasing protocols. In this paper, a new protocol FEP （fair electronic purchase） without a special TTP but an online bank is presented based on a concurrent digital signature scheme. The FEP protocol guarantees fair electronic purchase of goods via electronic payment between consumers, merchants and their online banks. The protocol is practical and the analysis based on the game logics shows that it achieves the properties of viability, fairness, and timeliness.     

基于二次剩余的最优公平电子商务交换协议

设计了一个可适用于计算机网络如Internet上进行电子货物交易的高效最优公平电子商务协议.考虑到现有的电子支付手段的实际使用情况,协议中使用在线的电子支付系统.新设计的协议具有高效、实用、离线的TTP、真正公平、易于实现等优点.     

基于身份的盲签名在移动电子支付中的应用

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.     

Secure Order-Specified Multisignature Scheme Based on DSA

0 IntroductionAmultisignature scheme is useful in the case thatplural signers generate a signaturefor a single mes-sage. Many multisignature schemes have been pro-posed[1-7]upto date.These schemes can be classifiedintotwo types by the basicintractable problemassumption aswell as single signature schemes ,i .e.discrete logarithmproblem(DLP) based schemes and RSA problem basedschemes .In an order-specified scheme the message and sig-ning order must be guaranteed. Mitomi and Miyaji[6]proposed…     

基于离散对数问题的盲数字签名改进方案

盲数字签名在电子选举协议、安全电子支付等领域应用广泛.针对已有离散对数盲数字签名方案的缺陷,基于求解离散对数问题的困难性,提出了一个改进型盲数字签名方案,可以同时满足盲数字签名的正确性、匿名性、不可伪造性和不可追踪性等特性要求.     

基于新的群盲签名的电子现金系统

提出了一个实际的群盲签名体制，并说明如何利用它构造一个多银行参与的具有安全匿名的不可跟踪电子现金系统．新的群盲签名体制是基于DSA的变型体制构造的．     

基于代理签名的多银行电子现金系统

为了实现安全的电子支付，基于代理签名方案和Brands电子现金系统，设计了一种新的多银行电子现金系统．通过分析表明，由于引入了代理签名方案，新方案可以方便地取消发币银行的发币能力，克服了现有的基于群签名的多银行电子现金系统的群成员撤销困难、群成员合伙攻击等问题，是一个安全的电子现金系统．     

XML数字签名原理及在电子商务中的应用

文章描述了利用XML数字签名技术对电子交易文档进行数字签名的过程,并结合对一个电子支付信息文档利用DSA算法进行数字签名的实例,进一步阐述了XML数字签名的生成和验证步骤,给出了XML数字签名技术在电子商务中的具体实现,最后探讨了XML数字签名技术在电子商务中的发展前景。     

电子支付安全协议的Petri网模型及分析

通过对电子支付安全协议的研究,利用Petri网描述了电子支付安全协议处理流程;根据可达树分析了电子支付协议Petri网模型的正确性、安全性、公平性、可达性和活性. 基于Petri网理论研究电子支付安全协议的工作,对于指导电子支付相关安全项目的研究以及解决实际安全问题具有一定的理论价值和实践意义.     

基于代理签名的多银行公平可分电子现金系统

目的为了实现商家和用户各自使用不同银行的安全公平可分的电子支付。方法基于WI-Schnorr部分盲签名方案,通过引入代理签名,设计了一个无TTP的多银行公平可分电子现金系统。结果一方面,系统可以方便地撤销发币银行的发币权利,解决发币银行合伙攻击的问题;另一方面,系统保证了发币银行和合法用户的匿名性,实现对电子现金和用户的追踪。结论通过分析,证明该方案是一个安全的多银行可分电子现金系统。     

公平的无连接可分电子现金方案

基于二叉树、比特承诺、零知识证明等技术提出了一种具有完全无连接性,无需可信第三方参与的、公平的可分电子现金方案。方案的开户协议和取款协议复杂度均为O（N＋K）,用户花费任意一个节点的电子现金时间复杂度为O（poly（K）·polylog（N））,存款协议的时间复杂度与支付协议相同。方案的安全性基于强RSA问题假设、计算离散对数困难问题假设和单向哈希函数的存在性假设。     

A new efficient mobile micropayment scheme

This paper proposes a micropayment scheme designed for GSM mobile scenario, where the overload of computation, storage and communication for mobile phone is reduced by directing operations normally performed by the mobile user to the static portion of the network in view of its limited capability. Messages which received and sent during the payment are very simple and public key infrastructure is not needed, which reduces delay and removes the possibility of incomplete payment due to communications failures. Furthermore, all the information related to payment is encrypted by a shared symmetric key in our scheme, so the privacy of the mobile user is protected and the security of information is guaranteed. Compared with other mobile micropayment schemes in existence, no public-key operation is required, which minimizes the computation and storage overhead dramatically. In addition, restricted anonymous is also provided in our scheme.     

Electronic Payment Scheme to Prevent the Treachery

0 IntroductionWith the development of the Internet ,the demand forelectronic commerce is urgent . But few people canconduct electronic business securely at anyti me and anywhere,because the existed electronic business systems ,especially theelectronic payment systems ,have some secure problems . Oneof the most seriousl is the treachery.Here the treachery is means that all the participants inelectronic business could cheat to get some benefits alone orassociated with others in transaction in a…     

Feasibility analysis of two identity-based proxy ring signature schemes

Recently, proxy ring signature schemes have been shown to be useful in various applications, such as electronic polling, electronic payment, etc. Although many proxy ring signature schemes have been pro-posed, there are only two identity-based proxy ring signature schemes have been proposed until now, i. e., Cheng＇s scheme and Lang＇s scheme. It＇s unlucky that the two identity-based proxy ring signature schemes are unfeasible. This paper points out the reasons why the two identity-based proxy ring signature schemes are unfeasible. In order to design feasible and efficient identity-based proxy ring signature schemes from bilinear pairings, we have to search for other methods.     

基于椭圆曲线的DSA的门限签名

本文提出了一种基于椭圆曲线（ECC）的DSA的（n,t）门限数字签名方案,方案由四个部分组成：系统参数的建立、子密钥产生、签名算法过程和签名算法验证四个部分组成.DSA具有ElGamal签名和Schnorr签名的特点,又由于该方案是基于椭圆曲线密码体制和DSA密码体制基础上,因此保证了方案的安全性.     

Genetic approach for Cell-by-Cell dynamic spectrum allocation in the heterogeneous scenario

<正> In this paper,a genetic algorithm (GA) is investigated to deal with cell-by-cell dynamic spectrumallocation (DSA) in the heterogeneous scenario with temporal and spatial traffic demand changes,whichis also known as a difficult combinatorial optimization problem.A new two-dimensional chromosome encodingscheme is defined according to characteristics of the heterogeneous scenario,which prevents forminginvalid solutions during the genetic operation and enables much faster convergence.A novel randomcoloring gene generation function is presented which is the basic operation for initialization and mutationin the genetic algorithm.Simulative comparison demonstrates that the proposed GA-based cell-by-cellDSA outperforms the conventional contiguous DSA scheme both in terms of spectral efficiency gain andquality of service (QoS) satisfaction.     

基于半信任下的电子彩票方案

根据第三方的完全可信任性和半信任性,分别给出安全的电子彩票方案.安全分组和压缩验证的方法可以使得基于半信任第三方的电子彩票方案在验证电子彩票具有可行性的前提下,防止银行和发行机构伪造中奖的彩票和欺骗彩票的总销售额.     

一种原子有效的e-cash交易协议

原子性对于可靠、安全的电子商务交易是必不可少的,是参与交易各方利益的重要保证．基于Mu等设计的高效e—cash方案,提出一种原子、有效e—cash交易协议．该协议将数字商品传输有机地整合到支付过程中,在去除强假设条件下(通信信道可靠和交易双方诚实),协议不仅满足原子性、有效性,而且还为交易纠纷的解决提供非否认证据．     

网上现金支付系统及其应用

在电子商务环境下，国外先后出现了一些基于Internet开发的电子支付工具和应用系统，通过对国外现行电子支付方式之一的现金交易过程的研究，分析了电子现金支付的特点及存在的问题，认为电子现金支付方式在中国有着巨大的市场潜力，应采取有力措施推进它的应用进程。     

ACSEPP on-line electronic payment protocol

With analyzing the existing on-line electronic payment protocols, this paper presents a new on line electronic payment protocol named ACSEPP: Anonymous. Convenient and Secure Electronic Payment Protocol. Its aim is to design a practical electronic payment protocol which is both secure and convenient. Without using PKLCA frame, it realized the anonymity of consumer and merchant, the convenient of handling, the low cost of maintenance and the securily.