“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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