hacker.org

I solved this like "mystery file" by pressing the unpack shortcut in 7-zip until the solution was found. Does somebody know how this .bin-packing works? I first tried to write a script from hand to solve "mystery file" but the input string from the file is seemingly random hex-n...

I used dc

CodeX knows what he's talking about here. Trojans aren't the only way for someone get into a system.

I knew nothing about polyalphabetic ciphers beforehand but correctly guessed that this was a polyalphabetic cipher and that it would have about equal letter frequency (which it did), researched possible ciphers on wikipedia, guessed that this was the vigenere cipher, tried manually cracking the ciph...

I didn't know how to convert it into a raw file using imagemagick either, so I converted it to a text file and extracted the hex data instead.

bc, cat and a terminal window that tells you how wide and tall it is when you resize. Probably the easiest solution.

I used telnet myself