January 2021
Intermediate to advanced
547 pages
12h 4m
Chinese
Content preview from 网络安全评估（第三版）
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335
第 11 章
评估
TLS
服务
本章介绍了在识别
TLS
服务漏洞时应采取的主要步骤。在开始之前，先简单
介绍
TLS
的由来，以及为什么本书中尽量避免提及
SSL
。
在
20
世纪
90
年代，
Netscape Navigator
占据了浏览器市场
70%
的份额。
1994~1996
年，
Netscape Communications
开发了自己的传输层加密机制，即
安全套接层（
SSL
），借助于市场占有率的统治性优势，
SSL
被广泛采用。
IETF
设立了一个委员会，将
Netscape SSL 3.0
协议转化为一个标准，官方名
为传输层安全（
TLS
），并于
1999
年在
RFC 2246
中进行确认。
有不少书籍专门针对这一主题。
Ivan Risti
的《
Bulletproof SSL and TLS
》（
Feisty
Duck, 2014
）
注
1
是较好的一本，对
TLS
及其功能进行了详细介绍。
图
11-1
展示了
TLS
运行在
OSI
第
6
层，并为其上的应用层协议（本例中为
HTTP
）提供传输安全的情况。本章描述
TLS 1.2
的实现机理
注
2
，以及在对
TLS
和
SSL
端点进行测试时可采用的策略。
SSL 3.0
由于存在众多安全漏洞，
使用场景逐渐缩减，维护支持也面临过期的局面。
注 1： 参见 Ivan Risti 的博客。
注 2： 参见 RFC 5246。
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