IIS URL Rewrite "Rewrite Module error: Expression contains a repeat expression"
The other day, I had to migrate a website from a Linux / Apache web server to Windows Server IIS. Yes, that type of migration happens too, sometimes. The website in question had a lot of sub domains, all pointing to folders within the web root using that same name: foobar.example.com would redirect (rewrite) to www.example.com/foobar.
Cracking PHP rand()
Sjoerd Langkemper writes about Cracking PHP rand(): Webapps occasionaly need to create tokens that are hard to guess. For example for session tokens or CSRF tokens, or in forgot password functionality where you get a token mailed to reset your password. These tokens should be cryptographically secure, but are often made by calling rand() multiple times and transforming the output to a string. This post will explore how hard it is to predict a token made with rand().
Recursive scp and symlinks
Recursive scp without following symbolic links. TL;DR: when using recursive scp, symbolic links aren't preserved and are copied as if they are normal directories. So you have to look for another solution to recursively transfer symlinks over ssh. Here is one: Tar over ssh!