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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 padI got this question in an interview for internship.My question comes from Cryptography topic in division Cryptography of Data Structures & Algorithms II

Answer»

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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