Fleissner grille

noun

Fleiss·​ner grille

ˈflīsnə(r)-

: 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

Word History

Etymology

after Eduard Fleissner von Wostrowitz, Austrian cryptographer

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