Which feature distinguishes a transposition cipher from a substitution cipher?
Answer
It rearranges the positions of symbols.
Explanation
### Why this is right
Transposition changes where symbols appear in the data. Substitution instead replaces symbols according to a rule, so rearrangement is the distinguishing feature.
### The other options
- **B. It replaces each symbol with a different symbol**: this is the defining idea of substitution.
- **C. It uses a public key to identify a sender**: this describes neither transposition nor its distinction from substitution.
- **D. It produces a one-way hash**: hashing is a separate process used to support integrity.
### Remember
Transposition changes positions; substitution changes symbols.
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