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TAKE THE QUIZ“Fleissner”
We have one entry that includes the term Fleissner.
Fleissner grille
noun: a square grille designed to be reconstructed from a key word and used for cryptographic transposition without cover text and to be rotated 90 degrees on the paper whenever the spaces are exhausted so that a solid block of transposed ciphertext is produced after four successive turns or sometimes when reversal of the grille is provided for after eight turns
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Merriam-Webster unabridged
