密码学

Information Theory and Coding is one of the basic courses of the major Communication and Cryptology.

信息论与编码是通信/密码学类专业的一门基础课程。

In this paper we firstly discuss the general concepts of compter security and cryptology, and then describe the mostly used modern encryption methods and technologies. We detail the advantages and disadvantages of symmetric algorithm, public-key algorithm and one-way hash function. At last we put forward a new block cipher - permutation code, and describe the secret hash digital signature and online electronic contracting with the trusted third party system.

本文首先讨论计算机安全和密码学的一般概念，然后介绍现代加密手段常用的方法和技术，详细讨论了对称加密方法、公开密钥加密方法和单向散列加密方法的优点和不足，进而提出了一种新型的分组加密算法—排列码加密算法，并在此基础上实现了保密散列数字签名算法和有可信第三方参与的网上电子签约。

Using the technologies of DNA synthesis, DNA clone, PCR and DNA chip and the theory of computational complexity, an encryption scheme is formed. In the scheme, encryption is to confect a specially designed DNA mixture and decryption is the hybridization of DNA sequances on a DNA chip.

利用DNA合成技术、DNA克隆技术、PCR扩增技术以及DNA芯片技术，结合密码学的计算复杂度理论，提出了一种基于DNA技术的加密方法。

Design and cryptanalysis on group signature is always the hotspot in the field of cryptography.

对群签名的设计与分析始终是密码学领域的一大热点。

Source code for all these algorithms is in the public domain and has undergone years of cryptanalysis.

为所有这些算法的来源代码在公众领域里和经受了密码学分析。

In this thesis, the basic concepts of cryptogram including number theory and modular arithmetic are introduced.

本文介绍了密码学的基本概念，包括数论的基础知识和模运算的概念。

In recent years, research and design of crypt security chip is a very popular subject in the cross field between cryptogram and micro-electronics.

安全加密芯片的研究与设计，是当前密码学和微电子学交叉学科领域的主要研究方向和难点。

VPN is technology which use the cryptogram knowledge establishing a virtual private network in the environment of open public networks.

VPN是利用有关密码学知识在开放的公开网络上建虚拟专用网络的技术。

In addition, the existing of quantum non-cloning theory leads to the birth of quantum cryptograph.

再者，由量子态不可克隆的特性产生了量子密码学。

The important impact of quantum computation on modern cryptograph is talked about.

介绍了量子计算理论对现代密码学的重要影响，建立了量子保密通信模型，给出了几类量子攻击模式。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失