Dead blog/site links [ci skip]

guides/source/security.md

@@ -1033,4 +1033,4 @@ The security landscape shifts and it is important to keep up to date, because mi
 
 * Subscribe to the Rails security [mailing list](http://groups.google.com/group/rubyonrails-security)
 * [Keep up to date on the other application layers](http://secunia.com/) (they have a weekly newsletter, too)
-* A [good security blog](http://ha.ckers.org/blog/) including the [Cross-Site scripting Cheat Sheet](http://ha.ckers.org/xss.html)
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