In chapter 2, the basic algorithms and protocol of applied cryptography are introduced here, including symmetric-key cryptography, public-key cryptography, hash functions and key management protocols.
第二章介绍基本的应用密码学算法和密码协议，包括对称加密算法、非对称加密算法、散列函数、数字签名技术和密钥管理协议。
A symmetric algorithm requires that both the sender and receiver of the message use the same secret key; this is often referred to as secret key cryptography.
对称算法要求消息的发送方和接收方使用同一个秘钥；这通常被称作秘钥密码术。
Several technologies exist for encryption, such as symmetric key cryptography and asymmetric key cryptography.
目前有几种加密技术如对称密钥密码系统和非对称密钥密码系统。
The two main competing cryptography schemes are known as the secret-key (symmetric) system and the public-key (asymmetric) system.
现有两种主要的、相互竞争着的密码术，被称作秘钥（即对称）系统和明钥（即不对称）系统。
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 public key cryptography can just solve these problems, but it is much slower than the symmetric key cryptography.
而公钥密码算法正好可以解决这方面的问题，但在速度上远远不及对称密码算法。
This class can be flexibly used in VB to implement such cryptography algorithms as Symmetric Key, Public Key and Digital Signature.
使用该类可方便地在VB应用程序中实现对称密钥、公开密钥和数字签名算法，并且不受中英文编码方式的限制。
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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