You know what it looks like… but what is it called?
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
Love words? Need even more definitions?
Merriam-Webster unabridged
