You know what it looks like… but what is it called?
TAKE THE QUIZ“vigenere”
The following 2 entries include the term vigenere.
Vigenère cipher
noun: polyalphabetic substitution with alphabets derived from one pair of primary alphabets by sliding (as in the Vigenère tableau) for which the usual keying formula is P+K=C where P is the position of the plaintext letter in the plain component, C that of the ciphertext letter in the cipher sequence, and K that of the key letter in the normal alphabet and where positions are numbered from 0 to 25 and 26 is subtracted from sums above 25 compare beaufort cipher , progressive-alphabet cipher
Vigenère tableau
noun: 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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Merriam-Webster unabridged
