公钥和非对称公钥密码学使用一对密钥，其中的一个定义为私钥并加密存放，另外一个被称为公钥，通常无须加密。

Public Key and Asymmetric - Public-key cryptography uses a pair of keys, one that is designated the private key and kept secret, the other key is called the public key and is generally made available.

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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。

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.

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