一个好的入门课程可能是麻省理工学院的计算机网络与安全课程。我建议的一件事是不要忘记隐私。从某种意义上说，隐私确实是安全的基础，在有关安全的技术课程中并不经常涉及。你可能会在这门与互联网相关的道德与法律课程中找到一些关于隐私的材料。

对用户的密码加盐和散列。永远不要将它们以明文形式保存在数据库中。

你应该知道三个A。认证、授权、审计。典型的错误是验证用户身份，而不检查用户是否被授权执行某些操作，因此用户可能会查看其他用户的私人照片，Diaspora所犯的错误。很多人忘记了审计，在一个安全的系统中，你需要能够知道谁在什么时候做了什么。

我建议查看CWE/SANS前25个最危险的编程错误。它在2010年进行了更新，并承诺在未来定期更新。2009年的修订版也可以使用。

从http://cwe.mitre.org/top25/index.html

The 2010 CWE/SANS Top 25 Most Dangerous Programming Errors is a list of the most widespread and critical programming errors that can lead to serious software vulnerabilities. They are often easy to find, and easy to exploit. They are dangerous because they will frequently allow attackers to completely take over the software, steal data, or prevent the software from working at all. The Top 25 list is a tool for education and awareness to help programmers to prevent the kinds of vulnerabilities that plague the software industry, by identifying and avoiding all-too-common mistakes that occur before software is even shipped. Software customers can use the same list to help them to ask for more secure software. Researchers in software security can use the Top 25 to focus on a narrow but important subset of all known security weaknesses. Finally, software managers and CIOs can use the Top 25 list as a measuring stick of progress in their efforts to secure their software.

Mozilla的Web安全团队制定了一个很好的指南，我们在网站和服务的开发中都遵循这个指南。

为什么是重要的。 这都是关于权衡。 密码学在很大程度上分散了人们对安全性的注意力。