This article first analyzes the security of computer network, introduces basic technology that guarantee the security and emphasizes that cryptography is the core technology.
本文第一章分析计算机网络的安全性，介绍保障计算机网络安全的基本技术，指出密码技术是网络安全技术的核心。
Cryptography is an important technology of information security. It can guarantees information's confidentiality, integrality and authentication.
密码学作为信息安全的重要技术，能有效保障信息的机密性、完整性和鉴别。
Author studies IBE technology, analyses the principle of the Ellipse Curve Cryptography (ECC) and its performance and efficiency.
作者首先研究标识加密技术ibe，分析椭圆曲线密码的实现原理、性能以及效率。
Cryptography algorithm is the core of cryptography technology.
密码技术的核心是密码算法。
Quantum communication plays an important role of quantum information. The most typical quantum communication technology are quantum teleportation and quantum cryptography communication.
量子通信是量子信息中的一个重要分支，而其中最典型的量子通信技术是量子隐形传态和量子密码通信。
In this paper, the principles of digital signature is given, Meanwhile the key technology of digital signature: public key cryptography and Hash algorithms is introduced.
文章阐述了数字签名技术原理，并介绍了数字签名中的关键技术：公钥加密体制和哈希算法。
Traditional cryptography technology focused on the access control and confidentiality communications of digital products, but for authentication and copyright piracy tracing it is insufficient.
传统的密码学技术侧重于对数字产品的访问控制和保密通信，但是对版权认证和盗版追踪问题显得力不从心。
Public key cryptography, combined with the traditional symmetric cryptograph and the message digest technology, can provide confidentiality, integrity and proof of origin.
公钥密码技术结合传统的对称密码技术及信息摘要技术，可提供信息的保密性、完整性和信源确认，是多种安全应用的基础。
The technology adopted include categories of data fragment reassembly, protocol conversion, cryptography, intrusion detection, virus, and keyword filtering, authentication and audit and so on.
网闸所采用的技术包括数据分片重组、协议转化、密码学、入侵检测、病毒以及关键字过滤、身份验证及审核等。
However, they caused a series of security questions at the same time. The cryptography is the key technology of guaranteeing the information safety.
但同时也引发了一系列的安全问题，而密码技术是保证信息安全的关键。
Based on the ideas of public key cryptography, a new scrambling technology of digital image based on primitive roots is given.
以密码学中的公钥思想为基础，提出了一种基于原根的数字图像置乱技术。
With the development of computing technology and cryptography, high-speed digital physical noise generator is urgently required in cryptography at present.
由于数字物理噪声源可以产生随机性较好的随机数作为密钥，已被广泛应用于安全信息系统。
Part 2 (chapters 4-7) introduces the basic techniques of modern cryptography, including symmetric cryptography (block ciphers, stream ciphers), Hash functions, public-key cryptography technology.
第2部分(第4 ~ 7章)主要介绍现代密码学的基本技术，包括对称密码技术(分组密码、序列密码)、Hash函数、公钥密码技术等。
Part 2 (chapters 4-7) introduces the basic techniques of modern cryptography, including symmetric cryptography (block ciphers, stream ciphers), Hash functions, public-key cryptography technology.
第2部分(第4 ~ 7章)主要介绍现代密码学的基本技术，包括对称密码技术(分组密码、序列密码)、Hash函数、公钥密码技术等。
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