基于椭圆曲线的可转移不可否认的数字签名方案-计算机应用专业论文.docxVIP

摘要网络安全是火系到国家利益、集体利益和用户切身利益的大事， 摘要 网络安全是火系到国家利益、集体利益和用户切身利益的大事， 是只能依靠我困自身力量发展的技术。其中数字签名技术能够确认参 与者的身份，防止恶意的伪造、窜改，在网络通信安全方面起到重要 的保护作用。 本文首先讨论了网络安全的发展现状，概述了前人在数字签名方面的 主要成就。在此基础上提出了一个新的基于椭圆曲线的可转移不可否认的 数字签名方案，给出了验证协议和否认协议，并对方案的安全性进行了详 细的讨论。此方案就是将类似于E1Gamal的普通数字签名方案和椭圆曲线 密码体制有机的结合起来。它不但具有可转移不可否认签名方案的灵活性 (即可通过释放两个秘钥中的一个后转换成普通的数字签名)而且具有椭 圆曲线密码体制的优势(即秘钥短、高安全性等特点)。该体制是建立在 椭圆曲线离散对数问题这一数学难题之上的，和其它密码体制相比较而言 在同等安全强度下具有小得多的秘钥长度及分组长度。 关键字：网络安全；数字签名；椭圆曲线；可转移不可否认 AbstractThe Abstract The security of network information iS closely related tO the immediate interests of Ollr country，society and subscribers，which only can be developed by technology power of our OWI_1．。Among these，signature technology ensures participator’S identification against malicious bugging and distorting，and plays an important role in protecting the security ofnetworking communication． Firstly,in this P鞠er it iS talked about the present state of development on networking security,summarized the former outstanding contribution on the signature，Secondly,a new convertible undeniable signature scheme based on elliptic curves iS presented．In this Papel-not odv gives the validated protocol and denied protocol bm also diseusses the security of the scheme in detail．This scheme combines a colnmon signature scheme similar to ElGanlal signature SCheme with elliptic curve cryptosystem．This scheme not only has the flexibitity of convertible undeniable scheme，namely,it call be changed into common signature scheme by releasing a secret key,but also has攮e advantages of ell窭ic Ctilwe crypto—system, such as shorten length of secret key and higber security．This scheme is based Oil the elliptic curve diserete logarithm．which is one of the mathematic puzzles．Compared with other cipher systems，it has shorter lengtb of secret key and goupmg in the same security intensity． Key words：network security；digital signature；elliptic curve；convertible undeniable —— —— 熬至燮!燮篓壁慧至曼壅篓鬯兰篓妻整———— 嚣l{ 磊 陵菪计黧钒癌】}{{趟蛰及靼茜抒她办公麴动化、电子化麴菠震，司+簿视 瞬潦广泛应餍于秘研、毅谨、管谨