前向安全的指定接收者恢复消息的部分盲签名方案

在指定接收者恢复消息签名方案的基础上加入了前向安全性,提出一种新的部分盲签名方案.新方案能够减少通信量,避免因密钥的泄露而导致以前的所有签名无效,只有指定的接收者才能恢复原始消息,进一步加强了消息的隐秘性.新方案中签名发起人和签名者合作完成签名,签名密钥按周期更新,在签名过程中加入了最终可恢复消息的接收者的信息.安全性分析表明新方案满足部分盲性、前向安全性和不可伪造性等安全性要求.     

对无证书部分盲签名方案的分析与改进

目的 研究了几个无证书的部分盲签名方案,对其中的一个签名方案分析发现其存在严重的安全缺陷,并对出现伪造攻击的原因进行分析.方法 在签名阶段加入公共信息,并在签名时改变签名的形式.结果与结论 分析表明,改进方案不仅满足部分盲性,而且可以防止对公共信息的更改,并在随机预言模型下证明新方案是不可伪造的.     

A New ID-Based Proxy Blind Signature Scheme

An identity-based proxy blind signature scheme from bilinear pairings is introduced, which combines the advantages of proxy signature and blind signature. Furthermore, our scheme can prevent the original signer from generating the proxy blind signature, thus the profits of the proxy signer are guaranteed. We introduce bilinear pairings to minimize computational overhead and to improve the related performance of our scheme. In addition, the proxy blind signature presented is non-repudiable and it fulfills perfectly the security requirements of a proxy blind signature.     

Efficient privacy enhanced software registration with ID-based blind signatures

In existing software registration schemes, the privacy of users is not taken into account and may be in the risks of abuses. In this paper, we proposed a novel software registration system which can greatly reduce unauthorized use of software while keeping the privacy of users. To the best of our knowledge, this is the first system that the privacy of users is guaranteed in software registration. Our system enjoys a modular design and can be implemented by any secure ID-based partially blind signature scheme. Furthermore, the proposal allows flexible registration information definition. This feature makes our scheme flexible and practical for more software registration applications.     

Comment Fail-Stop Blind Signature Scheme Design Based on Pairings

Fail-stop signature schemes provide security for a signer against forgeries of an enemy with unlimited computational power by enabling the signer to provide a proof of forgery when a forgery happens. Chang et al proposed a robust fail-stop blind signature scheme based on bilinear pairings. However, in this paper, it will be found that there are several mistakes in Chang et al＇s fail-stop blind signature scheme. Moreover, it will be pointed out that this scheme doesn＇t meet the property of a fail-stop signature： unconditionally secure for a signer. In Chang et al＇s scheme, a forger can forge a valid signature that can＇t be proved by a signer using the ＂proof of forgery＂. The scheme also doesn＇t possess the unlinkability property of a blind signature.     

一种安全有效的盲签名体制

为了满足电子招投标系统的安全需求和提高它的运行效率，在分析椭圆曲线公钥密码、自认证公钥、Nyberg-Rueppel签名方案和位委托协议的基础上，设计了一种安全有效的盲签名方案，并对该方案的正确性、有效性和安全性进行了必要分析和证明．     

基于多线性映射的无证书代理盲签名方案

代理盲签名方案不能防止密钥生成中心不诚信行为,存在伪造签名的隐患。文章在无证书公钥密码学体系下,通过多密钥中心共同生成用户密钥,运用多线性映射的技术,提出一种基于多线性映射的代理盲签名方案。该方案满足代理盲签名协议的性质,同时可以防止单个密钥生成中心伪造签名。对该方案的正确性、安全性及攻击性进行了分析,结果表明,该方案具备较高的安全性,可以广泛应用于电子现金、电子银行和电子投票系统。     

Fair E-Payment Protocol Based on Simple Partially Blind Signature Scheme

0 Introduction The advent of E-commerce demands for a secure communication of digital information. It has been proven for years that this can be achieved by cryptography. Digital signature schemes are essential for E-commerce as they allow one to authoriz…     

Atomic Electronic Contract Protocol Based on Convertible Signature

A new class of atomicity, namely contract atomicity is presented. A new technical strategy based on convertible signature and two-phase commitment is proposed for implementing atomicity of electronic contract protocol. A new atomic contract signing protocol is given out by using EIGamal like convertible undeniable signature and commitment ofconversion key, and another new atomic contract signing protocol is brought forward by using RSA based convertible undeniable signature scheme and commitment of conversion key. These two new protocols are proved to be of atomicity, fairness, privacy, non repudiation.     

改进的代理盲签名方案

针对DLP问题代理盲签名方案不满足不可伪造性和不可链接性的缺陷,文章提出一个改进的代理盲签名方案。方案在盲签名阶段引入了代理签名者的私钥,能够抵御原始签名者的伪造攻击。同时改进了消息盲化过程,避免了代理签名者的链接性攻击。分析结果表明,改进后的代理盲签名方案具有更高的安全性。     

基于椭圆曲线的盲签名方案设计及其应用

盲签名技术作为一种特殊的数字签名技术，在电子现金、电子投票等领域得到了越来越广泛的使用；描述了ANSI（1999）颁布的标准椭圆曲线数字签名算法和盲签名技术原理，在结合椭圆曲线密码优越性的基础上，给出了一种新的强盲签名方案，经过分析和验证，新方案具有更好的安全性；最后给出了在电子现金和电子投票系统中的应用实例，解决了电子现金中的隐私与安全问题，以及在电子投票选举中具有匿名性和公正性的问题。     

基于椭圆曲线密码体制的部分盲签名方案

利用椭圆曲线离散对数问题的难解性,提出了三个基于椭圆曲线密码体制的部分盲签名方案,这三个方案可以看作是Schnorr,DSA,Nyberg-Rueppel签名算法的部分盲签名算法在椭圆曲线上的模拟,并对完备性、部分盲特性、不可伪造性、无关联性进行了分析。该方案具有较高的安全性,较低的复杂性。     

A Fair Off-Line Electronic Cash Scheme Based on Restrictive Partially Blind Signature

A fair off-line electronic cash scheme was presented based on a provable secure restrictive partially blind signature. The scheme is more efficient than those of previous works as the expiry date and denomination information are embedded in the electronic cash, which alleviates the storage pressure for the bank to check double spending, and the bank need not use different public keys for different coin values, shops and users need not carry a list of bank‘s public keys to verify in their electronic wallet. The modular exponentiations are reduced for both the user and the bank by letting the trustee publish the public values with different structure as those of previous electronic cash schemes. The scheme security is based on the random oracle model and the decision Diffie-Hellman assumption. The scheme can be easily extended to multi-trustees and multi-banks using threshold cryptography.     

改进的随机化部分盲签名方案

对张建中等提出的基于双线性对的随机化部分盲签名方案进行了安全性分析,发现方案不能抵抗篡改公共信息攻击.为此,提出了一个改进方案.分析结果表明,改进方案在满足不可伪造性、不可追踪性的同时,能够有效防止恶意的签名请求者非法修改事先协商的公共信息,保护签名者的合法权益.     

Efficient ID-Based Proxy Blind Signature Scheme

0 Introduction Ablind signature, primitively introduced by Chaum[1], plays a central role in cryptographic protocols such as e-voting,e-payment that require user anonym- ity[2,3]. Such a signature allows a user to obtain a signa- ture of a message in a wa…     

对一个无证书部分盲签名方案的分析与改进

对汤鹏志等提出的一种无证书部分盲签名方案进行了密码分析,指出方案中签名请求者可以非法修改协商信息.为了有效抵抗篡改协商信息攻击,提出了一种改进的无证书部分盲签名方案.在随机预言机模型下证明了改进方案对无证书密码体制的两类敌手的自适应选择消息和身份攻击是存在性不可伪造的,其安全性可以归约为k-CAA问题和ICDH问题.     

一种基于ElGamal体制的盲签名方案

在ElGamal公钥体制上提出了一种盲签名方案，较之基于RSA算法的盲签名方案有其明显的优点。通过有向因子的引入，在真正意义上实现了电子交易中的匿名特性。通过对其安全性的分析，证明了该算法达到了安全性和可操作性的实际要求，必将有利于推动电子商务的发展。     

一种基于GOST签名体制的代理盲签名方案

基于离散对数的困难性,利用GOST数字签名算法提出一种新的完全有效的代理盲签名方案,该方案高效安全,在发送代理子密钥时需要安全的秘密通道.     

A Proxy Blind Signature Scheme Based on DLP

0 Introduction The concept of blind signature was firstly intro- duced by David Chaum in 1982[1]. Since then, scholars have tried their best to propose various blind signature schemes and applied them to some security systems, such as e-cash and e-voting …     

An Efficient Threshold Blind Signature from Weil Pairing

Threshold blind signature is playing an important role in cryptography as well as in practical applications such as e-cash and e-voting systems, etc. In this paper, we present an efficient and practical threshold bind signature from Weil pairing on super-singular elliptic curves or hyper-elliptic curves over finite field and prove that our scheme is provably secure in the random oracle model.