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Codebusters: Caesar and Cipher Cracking

Make secret messages with a Caesar cipher and crack coded messages using letter frequency.

Grade 8Math ChallengeScience OlympiadMathTechnologyLogicNumber SenseCodingIntermediate40 to 70 min4 materials

What you'll learn

  • Encode and decode with a shift cipher
  • Count letter frequencies in a message
  • Use patterns to crack a code

Objective

Encode and decode with a Caesar cipher and use letter frequency to break a substitution cipher.

STEM concepts

CryptographyFrequency analysisAlgorithmsPattern recognition
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Materials and safety
Step-by-step instructions
Prediction, test sheet and results
Why does it work, challenge and project report

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