Vigenère tableau

noun
variants: or less commonly Vigenère table or Vigenère square

Definition of Vigenère tableau 

: a square cipher table formed by placing the same normal or mixed primary alphabet one step farther to the left on each successive line and used by reading the ciphertext letter within the table in the row and column defined by key and plaintext letters in alphabets in the left and top margins respectively

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History and Etymology for Vigenère tableau

after B. de Vigénère

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