11 Turning grille transposition ciphers
It should come as no surprise that there are types of transposition ciphers other than the two systems, complete and incomplete columnar transposition, covered in the previous chapters. Here are a few examples:
- Rubik’s Cube encryption: Douglas W. Mitchell proposed a transposition cipher that uses a Rubik’s Cube.1 The plaintext is written on the fields of the cube. A sequence of moves forms the key. Subsequently, one reads the ciphertext from the cube. When used properly, this kind of encryption is difficult, yet not impossible, to break.2
- Crossword encryption: In World War II, German spies sometimes ...
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