Vigenère tableau

noun

variants or less commonly Vigenère table or Vigenère square

: 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

Word History

Etymology

after B. de Vigénère

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