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Oh my... Thank you guys for pointing out that the solution is simple enough :D For those who got as far as to reading my comment: characters 4 and 6 are the same, and characters 5, 10 and 11 are the same as well :) If even this does not help, then take a moment to switch to a cup of coffee :) OK, I...

A hint from my side:

If you try brute-forcing it, look at the zeros that are already in there, this might give you an answer while you are still alive

It is always interesting to see other peoples solutions. I always wonder why I am solving my problems in Java, if other languages can do the job in fewer lines of code. However, the neat thing about the Java solution is that Java supports gzip without additional tools. In combination with ByteArray(...

Firebug FTW