网络安全与数字签名技术

网络安全与数字签名技术摘要数字签名也称电子签名，digital signature,是给电子文档进行签名的一种电子方法，是对现实中手写签名的数字模拟，在电子商务的虚拟世界中，能够在电子文件中识别双方交易人的真实身份，保证交易的安全性、真实性及不可抵赖性的电子技术手段。实现电子签名的技术手段有很多种，但目前比较成熟的、许多先进国家普遍使用的电子签名技术还是数字签名技术，它力图解决互联网交易面临的几个根本问题：数据保密、数据不被篡改、交易方能互相验证身份、交易发起方对自己的数据不能否认。数字签名技术在其中起着极其重要的作用，如保证数据的完整性、私有性和不可抵赖性等方面，占据了特别重要的地位。目前群盲签名(blind signature,group signature)方案效率不高，这样的电子现今系统离现实应用还有一段距离，因此研究高效的群签名方案，对于实现这样的系统具有重要意义。关键词：数字签名，网络安全，blind signature,group signatureABSTRACTDigital signature,also known as electronic signature,is an electronic method ofsigning electronic documents.It is a digital simulation of handwritten signatures inreality.In the virtual world of e-commerce,it is an electronic technical means that canidentify the real identities of both parties in electronic documents and ensure thesecurity,authenticity and invincibility of transactions.There are many technical meansto realize electronic signature,but the electronic signature technology that is relativelymature and widely used in many advanced countries is still the "digital signature"technology,which tries to solve several fundamental problems faced by Internettransactions:data confidentiality,data can not be tampered with,transaction parties canverify their identities with each other,and transaction initiators can not deny their owndata.Digital signature technology plays an extremely important role in it,such asensuring the integrity,privacy and non repudiation of data,and occupies a particularlyimportant position.At present,the efficiency of blind signature (group signature)scheme is not high.Such an electronic system today is still a long way from practicalapplication.Therefore,it is of great significance to research an efficient group signaturescheme for implementing such a system.Keywords:digital signature,network security,blind signature,group signature目录摘要.IABSTRACT…第一章引言第二章信息网的安全问题.22.1网络的安全威胁….22.1.1外部威肋：22.1.2内部威胁：.32.2信息网络的安全性..32.2.1网络的安全系统….32.2.2网络安全的安全点设置2.3信息安全技术发展趋势.42.3.1加密….42.3.2鉴别2.3.3访问控制.5第三章数字签名….63.1数字签名概述..63.2数字签名原理.63.3数字签名技术73.3.1公钥密码体制.73.3.2数字签名.83.3.3数字签名技术与加密技术的结合83.4用非对称加密算法进行数字签名93.4.1算法的含义.….93.4.2签名和验证过程.93.5用对称加密算法进行数字签名.….103.5.1算法的含义…..103.5.2签名和验证过程.103.6群数字签名方案.….113.6.1高效可验证的安全数字签名方案3.6.2面向流信息的数字签名....12