单词 | Fleissner grille |
释义 | Fleissner grillenoun 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 |
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