一种不可追踪的离线电子现金

介绍了一种新型的不可追踪的离线电子现金系统的设计方法和三个协议,提出了通过可信证书机构和支付者的签名可阻止这种电子现金的多重花费。     

基于身份的代理盲签名在电子现金中的应用

为克服多人同时申请电子现金时银行可能遇到的网络或计算瓶颈,将椭圆曲线上双线性对运算与代理盲签名的特性相结合构造了一个较为实用的电子现金系统,使得银行在遇到上述问题时可将电子现金签发权交给其下的各支行去完成,从而在保证安全的同时提高了系统的效率.     

基于身份的在线电子现金系统设计

本文在了解并分析国内外的盲签名技术应用现状和发展趋势,特别是基于身份的部分盲签名技术方案的基础上设计并实现了基于身份的在线电子现金系统.作者设计实现了在电子支付流程中3个身份主体(用户、银行、商家)间4个主要过程:开户注册、提取现金、用户消费、银行支付.最后对本文工作进行了总结并展望系统的发展.     

可直接计算的高效的可分电子现金系统

 针对现有的基于可信第三方的可分电子现金存在用户花费电子现金效率低、用户花费时要从根节点一层一层计算的缺点,在无可信第三方的基础上,首次将节点可直接计算与可再分的方法引入到离线可分电子现金中,提出了一种新型的无可信第三方的离线可分电子现金系统.该协议在基于同一棵二叉树时,用户所能花费的电子现金总额是原来的n倍(n是二叉树层数),由同一电子现金分出的不同节点具有不可链接性,而且花费二叉树上任一节点所做的计算量是一样的,从而提高系统的整体效率.     

`Minting' electronic cash

Electronic equivalents of traditional cash payment systems are being launched worldwide. Electronic cash can combine the benefits of traditional cash with those of payment by debit and credit card, while circumventing both their shortcomings. As with traditional cash, electronic cash should have high acceptability and be suitable for low value payment from person to person. With the possible exception of online payment platforms such as the Internet, it is preferred that payments be verifiable offline, without the bank's involvement, for reasons of cost effectiveness and speed. To facilitate electronic cash payments over the phone and the Internet, physical proximity of payer and payee should not be necessary. Moreover, electronic cash should offer privacy of payments. In particular, payments by an honest payer should be untraceable, and information about transaction content should remain privy to payer and payee. Yet a payer ought to always be able to trace the payee; traceability suits electronic cash and is as open to extortion, money laundering, and bribery as a check or wire transfer. Lastly, as with payments by debit and credit card, electronic cash should be convenient to store and transport, while protecting users against loss, theft, and accidental destruction     

电子现金支付协议的研究

本文提出了一个高效的电子现金支付协议，与目前被广泛采用的Brands的电子现金协议相比较，其效率更高，而且更加适合采用预处理的方法，本文详细描述了该协议，并对其安全性和效率进行了分析和证明。     

基于不可信赖托管者的公平电子现金

利用RSA盲签名技术,给出了一种基于托管者的公平电子现金协议,重复花费者将以非常大的概率被托管者恢复出其身份。与以前协议不同的是:除非托管者与银行勾结,他无法提取用户的现金,而且托管者只能追踪银行要他追踪的现金,从而最大程度的保证了用户的隐私。该协议还可以追踪可疑的现金和用户,从而可防止和减少电子现金系统的犯罪活动洗钱,勒索等。用户在提取现金时,托管者脱线提供服务,所以效率较高。     

Air Products pays cash for Ashland's electronic chemicals business

In a cash transaction of approximately $300m, Air Products has signed a definitive agreement to acquire the Electronic Chemicals business of Ashland Specialty Chemical Company, a division of Ashland Inc. Subject to regulatory approvals, the acquisition is expected to be accretive to earnings in the first year. Closing would follow receipt of regulatory approvals.This is a short news story only. Visit www.three-fives.com for the latest advanced semiconductor industry news.     

Cowry shell to smart card [electronic cash]

Cash, cheque, credit card, debit card, store card-methods of payment can seem bewildering in their variety. Here, the author describes how the Mondex system of electronic cash could bring order, convenience and security to the inescapable need to pay for goods and services     

基于ECC的限制性盲签名电子现金支付的研究

椭圆曲线密码体制(ECC)构建的电子现金系统具有更短的密钥长度与更高的计算效率,提出了基于ECC的限制性部分盲签名及离线电子现金方案,实现系统参数、取款协议、支付协议和存储协议的研究。     

Full privacy preserving electronic voting scheme

Privacy is an important issue in electronic voting.The concept of ’full privacy’ in electronic voting was firstly proposed,not only the privacy of voters is concerned,but also the candidates’.Privacy preserving electronic election architecture without any trusted third party is presented and a general technique for k-out-of-m election based on distributed ElGamal encryption and mix-match is also provided.The voters can compute the result by themselves without disclosing their will and the vote of the losing candidates.Moreover,whether the vote of winner candidate is more than a half can be verified directly.This scheme satisfies ’vote and go’ pattern and achieves full privacy.The correctness and security are also analyzed.     

安全电子时间戳系统的设计方案

在电子政务与电子商务系统中，机要电子文档、重要商业合同与电子交易等都需要安全、准确、权威的统一时间，因些有必要在电子数据信息流中加入时间标识，即时间戳。本文主要分析了安全电子时间戳系统设计的一般方法及应注意的一些因素，并结合我国实际给出了一种电子时间戳系统的设计方案。     

基于DC-net的会议室电子选举方案

提出了一种新的适用于小规模选举活动的电子选举方案,其最大特点是能够提供无条件的完美选票秘密性保障。方案具有自计票功能,能够实现公平性和可验证性。敌手对选举结果的破坏等同于解离散对数问题。该方案建立在DC-net匿名广播协议基础之上,其安全性不依赖于任何信任中心,但需假定任意投票者之间存在秘密信道。