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Username: natas8
Password: DBfUBfqQG69KvJvJ1iAbMoIpwSNQ9bWe
URL: http://natas8.natas.labs.overthewire.org

Solution

Let’s check out the sourcecode.

Oh no. It looks like they encoded their secret code. If only we could reverse it. Oh wait, we totally can. Let’s use php -a to use an interactive PHP interpreter.

Alright, let’s input the encoded secret code.

Now let’s run the encoding algorithm in reverse order on the encoded secret.

Easy peasy. Let’s input our code into the form and submit.

Yippee.