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The system is composed of trust model, structure and function design, certificate database design, and implements the core functions of a standard CA system including signing, issuing and revoking certificates. The security communication modular of the system is based on the SSL Protocol to enhance the security of system communications. Besides, the kernel functions of the system are packed into DLL library, including symmetrical encryption algorithms, digest algorithms, digital signature algorithms and certificate operations such as certificate request, certificate building, certificate format conversion etc.

本文的主要工作是：在研究PKI相关技术的基础上，设计了企业CA系统方案，包括信任模型、结构和功能设计、证书库的设计；实现CA系统中最为核心的数字证书管理，提供数字证书的签发、注销和发布等各项功能；实现了基于SSL协议安全通信模块，增强了系统通信的安全性；系统采用动态链接库技术封装了对称加密算法、数字摘要算法、签名算法以及证书处理(包括证书请求、证书生成、证书格式转换等功能)，以动态链接库的形式提供调用接口，成为应用的安全基础设施。

Chapter 3 dissertates the structure, trust model, security performance and development of PKI, then discusses the correlated technologies of PKI which includes message digest, digital signature, digital time stamp, digital certificate, SSL, SET and IPSec protocol.

首先分析了PKI的体系结构、信任模型、安全性能和发展方向，然后讨论了PKI的相关技术：包括消息摘要，数字签名，数字时间戳，数字证书，SSL协议，安全电子交易(Secure Electronic Transaction，SET)协议，和Internet安全协议(Internet Protocol Security，IPSec)。

With the development of the technology of computer and network communication, digital signature schemes have got extensive application.

随着计算机和网络通信技术的发展，数字签名技术得到了广泛的应用。

Ontario has introduced a one-piece plastic driver's licence. The licence has a digitized photograph and signature of the driver and a magnetic information strip.

安省所采用的驾照是单卡式塑料制成的，上面印有一张驾照持有人的数码化照片和签名，还带有一条信息磁条。

We'll continue to evolve our audio signature in new and relevant ways, said Dillon.

迪林说：我们将继续以新方式发展声音形象。

The main task of this article contains:compares algorithm and encryption and decryption between the widely-used public key encryption system RSA and ECC;(2) directing against present elliptic curve attack algorithm, uses SEA algorithm to perform choosing of safe elliptic curve and to achieve based on prime field elliptic curve"s ELGamal encryption and decryption and digital signature;(3) discusses elliptic curve"s application on smart card and proposes two identification plans based on EEC.

2针对目前已有的椭圆曲线攻击算法，使用SEA算法实现了安全椭圆曲线的选取，实现了基于大素数域上的椭圆曲线的ELGamal加解密和数字签名。(3)讨论了椭圆曲线在智能卡上的应用，并提出了两种基于ECC的身份认证方案。

A new RSAbased undeniable signature scheme was proposed which is more efficient because of its 3move confirmation and disavowal protocols.

提出了一个新的基于RSA的不可否认签名方案，该方案的确认协议和否认协议是三次传递的，因而提高了效率。

The digital signature is the powerful safeguard of the developing of E-business. It plays an important role in realizing the functions of identification anthentication, data integrity and denying the disavowal.

数字签名是开展电子商务的有力保障，在实现身份认证、数据完整性和不可抵赖性等功能方面都有重要作用。

As an important technology on data authentication, digital signature can be used to identify the instance of denying, forgery, tamper and imitation in today's communication network. It can provide the data integrity, figure authentication, and also prevent from disavowal of a sender during data transmission.

在现代的数字通信网络中，数字签名作为数据认证技术中的一项关键技术，可以解决否认、伪造、篡改及冒充问题，用来保证信息传输过程中的完整性，提供信息发送者的身份认证和不可抵赖性。

Group signature ; discrete logarithm ; private key

群签名；离散对数；密钥

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。