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Which of the following cipher is formed by applying columnar transposition cipher twice?

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Which of the following cipher is formed by applying columnar transposition cipher twice?

(a) Rail Fence cipher

(b) Route cipher

(c) Double transposition cipher

(d) One time pad
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The correct option is (c) Double transposition cipher

Explanation: Double transposition cipher is formed by applying columnar transposition cipher twice. For the purpose of encryption, we may use the same key twice or we can use two different keys.
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