Basic Ciphers & Codes
📋 What it is
A cipher hides a message by swapping letters with a fixed rule; the rule (the key) unlocks it.
🗣️ Coach says
The Caesar cipher shifts every letter by the same amount (shift 3: A→D). To escape, you find the shift and slide every letter back. The rule IS the key — once you have it, the whole message unlocks.
🧠 Memory hook
Find the shift, slide every letter back. The rule is the key.
😂 Giggle
What did the locked door say to the player?
"You really need to get a handle on this!"
😲 Whoa!
Julius Caesar used a shift cipher to send secret orders 2,000 years ago — and the same swap-the-letters idea, made far stronger, still hides your online messages today.
✅ Quick check: With a Caesar shift of 1 (A→B), decode “DABCF”.
Say your answer out loud first — then reveal.
“CZABE”? No — shift each letter BACK by 1: D→C, A→Z, B→A, C→B, F→E = “CZABE”. (Check each letter against the rule.)
Reversing the known shift decodes each letter exactly; always apply the rule letter by letter.
🧪 Try it! (2 minutes)
Write your name with a shift-of-3 cipher and have a friend decode it using the shift you give them.