Exam-style question
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A Caesar cipher uses a shift of 4. Using A = 0, B = 1, and so on, what is the ciphertext for the plaintext letter C?.
- A.F
- B.G
- C.H
- D.I
Model answer
What a good answer should say
- G
Explanation
Why this works
C has value 2. Applying a shift of 4 gives 2 + 4 = 6, which corresponds to G.
Common mistake
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