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Re:Ask HN: Primer on Web Security by tptacek on Wednesday June 03, 2009 @02:41PM (#640185)
I like Dafydd Stuttard's "The Web Application Hacker's Handbook", despite the title. Work through the examples.

A lot of people will direct you to OWASP, which is not a bad free tertiary source (owasp.org). There's lots of HOWTO stuff there. Be careful about the OWASP Top 10. You want to know what it is, but it's showing its age.

Re:Ask HN: Primer on Web Security by pasbesoin on Wednesday June 03, 2009 @03:42PM (#640265)
While looking at the recommendation, I noted that the book's website has a page of links to tools:

http://portswigger.net/wahh/tools.html

Nothing eyebrow raising, but if you're starting out, worth knowing about.

Re:Ask HN: Primer on Web Security by tptacek on Wednesday June 03, 2009 @03:45PM (#640275)
Portswigger is the author of Burp, which is the industry standard web application testing tool. Almost everyone I know in the field uses it.