What information entered the process?
Labs / Computer Science
Caesar Cipher Cracker
Drag the cipher wheel to shift every letter of your message by the same amount — that is a Caesar cipher, the code Julius Caesar used. Then load a secret and try to break it: the histogram compares the coded letters against how often each letter really appears in English, and the “likely key” is the shift that makes them line up.
Labs / Computer Science / Caesar Cipher Cracker
Caesar Cipher Cracker
Drag the cipher wheel to shift every letter of your message by the same amount — that is a Caesar cipher, the code Julius Caesar used. Then load a secret and try to break it: the histogram compares the coded letters against how often each letter really appears in English, and the “likely key” is the shift that makes them line up.
Why it matters
Why explore this?
Computer science turns clear rules into reliable processes. This model lets you step through those rules and see how each decision changes the result.
Explore
Try the model
shift 3χ² –likely key –
Investigate
Questions to test
Predict first, try it in the model, then use what you observe to answer.
What to try
- With shift 3, which plaintext letter turns into “E”? Can you read the mapping straight off the wheel?
- Load a Secret and slide the shift by hand. How does the histogram change as the coded text starts to look like real English?
- Why does the tall “E” spike in the English overlay give away the key so quickly? What if a message had no letter E at all?
- Press Brute-force 26. Which shift gives the smallest χ² score, and is it always the true key for short messages?
- A shift of 26 leaves the text unchanged — so how many genuinely different Caesar keys are there, and why does that make this cipher easy to crack?
Explain
Make sense of what happened
Trace the process one step at a time. Name the rule used at each important step, then explain why the final result follows from those rules.
Check
Before you leave
Which rule changed it?
Why did the process produce this result?
If you can answer all three using evidence from the model, you understand the main idea. If not, return to Explore and change one setting at a time.