Cryptanalysis & Hidden Messages
📋 What it is
Cryptanalysis cracks codes without the key (e.g. by letter frequency); steganography HIDES that a message even exists.
🗣️ Coach says
Two escape-room arts: cryptanalysis breaks a cipher by clues — like “E is the most common English letter, so the most common symbol is probably E.” Steganography instead HIDES the message (first letters of each line, invisible ink). One breaks codes; the other hides them.
🧠 Memory hook
Cryptanalysis: crack it with clues (E is most common). Steganography: hide it in plain sight.
😂 Giggle
What do you call a hint that doesn't help?
A red herring — and it smells fishy!
😲 Whoa!
During WWII, code-breakers cracking the Enigma machine used letter-frequency clues and are said to have shortened the war by years — cryptanalysis has literally changed history.
✅ Quick check: In a long coded message, the symbol “#” appears far more than any other. What letter is it likely to be?
Say your answer out loud first — then reveal.
Probably E — the most common letter in English; frequency analysis uses that to crack a substitution cipher.
Letter-frequency patterns leak information even without the key.
🧪 Try it! (2 minutes)
Write a hidden message where the FIRST letter of each line spells a secret word (that’s steganography).