This is an explanation of the Cryptography challenge 'New Caesar' from CyLab Security Academy (formerly picoCTF). You are provided with a short ciphertext and the single Python script that created it.

This was programmed by me as a teaching aid to allow Year 9 pupils to see both how the Caesar Cipher works and to link it directly to programming and computational thinking. It can be used to have ...

plaintext AND to decrypt a ciphertext. That is four operations, and most resources show one. Every sheet here does all four. 8-bit ASCII code is given, and so is the one-time pad’s; the student poses ...