Little contest: Crack my ‘ROT13 On Steroids’ cypher

update: Added a form online and changed the last chapter
A few weeks ago I was in a what-to-code-right-now-mood and inspired by The Gold Bug I decided to write a little easy cypher in PHP (could have been any languageTM of course) without any secret key. You know, just for fun.
So what did I write exactly? [...]

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