Discussion
Encrypt “INTERNET” using transposition cipher with the following key :
3 5 2 1 4
1 2 3 4 5
Answer: D
The cipher text is TRNIE TZENZ.
Split the plaintext into blocks of five, padding the last with Z: INTER and NETZZ. The key's top row tells which plaintext position goes into each cipher position: the first cipher letter is plaintext letter 3, then 5, 2, 1 and 4.
INTER: letters 3, 5, 2, 1, 4 are T, R, N, I, E, giving TRNIE. NETZZ: letters 3, 5, 2, 1, 4 are T, Z, E, N, Z, giving TZENZ.
The other options are wrong arrangements: (B) simply swaps the two padded blocks, and (A) and (C) do not follow the key's order of positions.
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