共查询到17条相似文献,搜索用时 453 毫秒
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针对已提出的一种基于椭圆曲线的前向安全数字签名方案进行安全性分析,发现该方案存在安全隐患,不具备前向安全性.利用椭圆曲线上Weil配对的双线性性质对原方案进行改进,构造了一种新的基于椭圆曲线的前向安全数字签名方案,方案的安全性建立在目前还没有有效攻击方法的有限域上的非超奇异椭圆曲线离散对数问题之上.新方案具有前向安全性、抗伪造性等性质,有一定的理论和实用价值. 相似文献
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提出一个新的基于椭圆曲线密码体制的广播多重数字签名方案。本方案能够克服已有的方案不能适用于广播签名的缺点,同时能够实现多重数字签名私钥的共享。与已有的椭圆曲线数字签名方案(ECDSS)相比,该方案效率高,可以有效的抵抗多种攻击,安全性较高。 相似文献
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徐晓东 《南京邮电学院学报(自然科学版)》2003,23(1):43-46
基于Rabin算法和椭圆曲线数字签名算法(ECDSA),提出了一个适用于移动通信网,适合在智能卡上实现的认证方案,并对该方案的安全性和计算复杂性进行了分析。 相似文献
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在分析基于椭圆曲线的XML数字签名流程及其安全性的基础上,改进影响椭圆曲线签名算法(ECDSA)实现效率的关键模块,提高其整体运算效率,实现了基于椭圆曲线的XML签名服务。在统一平台上对三种公钥密码服务实现XML数字签名的性能进行比较,实验结果表明,在XML签名中使用ECDSA,能够实现网络环境中高安全性、高效率的数字签名处理。 相似文献
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Hu Bin Jin Chenhui 《电子科学学刊(英文版)》2006,23(1):54-57
Proxy signature is a special digital signature which enables a proxy signer to sign messages on behalf of the original signer. This paper proposes a strongly secure proxy signature scheme and a secure multi-proxy signature scheme based on elliptic curve cryptosystem. Contrast with universal proxy signature schemes, they are secure against key substitute attack even if there is not a certificate authority in the system, and also secure against the original signer's forgery attack. Furtherlnore, based on the elliptic curve cryptosystem, they are more efficient and have smaller key size than other system. They can be used in electronics transaction and mobile agent environment. 相似文献
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现有的代理数字签名方案大多是基于离散对数问题和大数因子分解问题的方案.本文将代理签名的思想用于椭圆曲线数字签名,提出了基于椭圆曲线的代理签名方案,除了满足代理签名的七条基本性质外,还对目前已有的代理签名方案中尚未很好解决的问题--代理权的滥用进行了有效的控制.在本方案中,签名人不能生成代理签名,也不能给多于一个的人以代理权,真正做到了对签名代理权的控制.本方案基于椭圆曲线,且整个过程参与方少,具有安全性高、密钥量小、便于实现等优点. 相似文献
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基于椭圆曲线的限制代理签名方案 总被引:3,自引:0,他引:3
基于椭圆曲线提出了一个限制代谢签名者的代理签名次数和代理签名期限的代理签名方案。原始签名者在代理签名有效期内,能限制代理签名者的代理签名次数,当代理签名有效期过后,能收回代理签名权。该方案克服了通常的代理签名方案中一旦原始签名者将答名权委托给代理签名者,就无法控制代理签名者的代理签名次数,无法收回代理签名权的缺点,该方案是基于椭圆曲线,采用一次一密签名构造的,具有安全性高,速度快,密钥量小,便于实现等优点。 相似文献
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To solve the problems of pollution attacks of single-source and multi-source network coding,two homomorphic signature schemes for network coding were proposed.In homomorphic signature for single-source network,the message hash value was signed on the elliptic curve,then the message,hash value and the signature of hash value were output,and the receiving node could verify the signature,the elliptic curve signature based on homomorphism could resist intra/inter-generation pollution attacks.Homomorphic signature from pairings for multi-source network coding could resist pollution attacks,and the introduction of timestamp made it be capable to resist replay attacks.In the random oracle model,it proves that two schemes are all secure under the selective attacks.Analysis shows that two schemes can effectively improve the verification efficiency. 相似文献
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Proxy signature is an active research area in cryptography. A proxy signature scheme allows an entity to delegate his or her signing capability to another entity in such a way that the latter can sign messages on behalf of the former. Many proxy signature schemes using bilinear pairings have been proposed. But the relative computation cost of the pairing is more than 10 times of the scalar multiplication over elliptic curve group. In order to save the running time and the size of the signature, we propose a proxy signature scheme without bilinear pairings and prove its security against adaptive chosen‐message attack in random oracle model. The security of our scheme is based on the hardness of the elliptic curve discrete logarithm problem. With the running time being saved greatly, our scheme is more practical than the previous related scheme for practical applications. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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两个基于身份的数字签名方案的安全性改进 总被引:2,自引:0,他引:2
分析了文献[1]提出的两个基于用户身份的数字签名方案,发现其一般签名方案存在安全性缺陷,在此基础上建立了多重签名方案,但此方案也是不安全的。本文给出了改进的签名和多重签名方案。 相似文献