The Vigenère cipher uses a 26×26 table with A to Z as the row heading and column heading This table is usually referred to as the Vigenère Tableau, Vigenère Table or Vigenère Square.We shall use Vigenère Table. The Vigenere cipher uses this table together with a keyword to encipher a message. The calculation can be communicated in arithmetical structure as given underneath. Vigenère cipher Example. Vigenere Cipher is a polyalphabetic substitution technique that is used for encrypting and decrypting a message text. In the Vigenère cipher table which has a 26*26 matrix, encryption is done in the following way: Let us assume the plaintext to be JAVATPOINT . And the key to be BEST . Using the table, you can see that Vigenère essentially consists of multiple different Caesar ciphers in a row. It uses a Vigenere table or Vigenere square for encryption and decryption of the text. A variant of the Vigenère cipher, which uses numbers instead of letters to describe the sequence of shifts, is called a Gronsfeld cipher. The Vigenère square or Vigenère table, also known as the tabula recta, can be used for encryption and decryption. The Vigenère cipher is an improvement of the Caesar cipher, by using a sequence of shifts instead of applying the same shift to every letter. Encryption. Let us perform Vigenère cipher encryption and decryption on this plaintext and key . The Vigenere Cipher follows its name from a French cryptographer Blaise de Vigenere. The key letter is shown at the beginning of each row. Vigenère cipher is a simple polyalphabetic cipher, in which the ciphertext is obtained by modular addition of a (repeating) key phrase and an open text (both of the same length). Starting with the second row, each row has the letters shifted to the left one position in a cyclic way. At long last the encoded message content is: Encoded Message: ALPNFHDJAFVKCLATIC . Vigenère gains it strength by using more than one Caesar cipher and using a "key", which is a word or phrase used to encipher and decipher the message. For example, suppose we wish to encipher the plaintext message: TO BE OR NOT TO BE THAT IS THE QUESTION using the keyword RELATIONS. The Vigenère cipher uses this table together with a keyword to encrypt a message. The encryption can be described by the following formula: Vigenere Cipher Table where T line and H section harmonizes for example A. The Vigenère cipher uses this table in conjunction with a key to encipher a message. We begin by writing the keyword, repeated as many times as necessary, above the plaintext message. Vigenère cipher Encoder . The column header (x axis) letter represents the letter you want to encipher from your plaintext, and the rows header (y axis) is the corresponding letter on your key, the intersection shows the resulting ciphertext of the two. The vigenere table is also called the tabula recta. Method 1. The first row of this table has the 26 English letters. All 26 possible Caesar ciphers are represented in the table (one per row), since each row displays the alphabet shifted by one more letter than the above row. Encoding Vigenère. This cipher is a substitution cipher that supports encryption and decryption of only alphabetic text. To find the encryption, we take the letter from the intersection of the Key letter row, and the Plaintext letter column. Also Read: Caesar Cipher in â¦ 2. In this technique we use a table of alphabets A to Z which are written in 26 rows which is also known as Vigenere Table. So, if we were to encode a message using the key COUNTON, we write it as many times as necessary above our message. Rehash a similar procedure for every single outstanding letter set in the message content. 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