The technique's called: The Steel Finger.
I grew tired of all the lame "crypto" challenges out there, which basically
throw some random obfuscated text at you with the request to "decode the message".
In case you didn't realize, this has nothing to do with
just nonsense. On the other hand, you have stuff like data's challenges in the
which are literally impossible to solve without solid mathematical background
knowledge. Thus, I decided to give you something which an average coder can
solve, but which is also educational and forces you to research some early
basics of cryptanalysis.
- vigenere chiffre
- linear transformation ciphers