Image Gallery: Transposition cipher

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Step-by-step process for the double columnar transposition cipher.
Gallery 1, Image 1: Step 1: The plaintext message is written into the first grid (which has the key JANEAUSTEN).
Gallery 1, Image 2: The columns are read off in alphabetical order according to the key, into the next grid (see step 2).
Gallery 1, Image 3: Step 2: The columns from step 1 are written into the second grid (which has the key AEROPLANES).
Gallery 1, Image 4: The columns are read off in alphabetical order according to the key, into the next grid (see step 3).
Gallery 1, Image 5: Step 3: The ciphertext is often written out in blocks of 5, e.g. RIAES NNELI EEIRP etc.

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