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What is double transposition cipher? Describe with example.
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written 8.5 years ago by |
Plaintext: attack at four
First transportation: permute rows from (1, 2, 3) to (3, 2, 1)
Middle text: fourckatatta
Second transportation: permute columns from (1, 2, 3, 4) to (4, 2, 1, 3)
Ciphertext: ROFUTKCAATAT