This process continues continuously until the plaintext is finished.ĭecryption is done by the row of keys in the vigenere table. The column of plain text "A" and row of key "E" intersects the alphabet of "E" in the vigenere table, so the second letter of ciphertext is "E". Similarly, the second letter of the plaintext is combined with the second letter of the key. The column of plain text "J" and row of key "B" intersects the alphabet of "K" in the vigenere table, so the first letter of ciphertext is "K". The first letter of the plaintext is combined with the first letter of the key. To generate a new key, the given key is repeated in a circular manner, as long as the length of the plain text does not equal to the new key. When the vigenere table is given, the encryption and decryption are done using the vigenere table (26 * 26 matrix) in this method.Įxample: The plaintext is "JAVATPOINT", and the key is "BEST".
The vigenere table is also called the tabula recta.
It uses a Vigenere table or Vigenere square for encryption and decryption of the text. This algorithm was first described in 1553 by Giovan Battista Bellaso. This algorithm is easy to understand and implement. It is an example of a polyalphabetic substitution cipher.
Vernam encryption algorithm series#
The vigenere cipher is an algorithm of encrypting an alphabetic text that uses a series of interwoven caesar ciphers. The vigenere cipher is an algorithm that is used to encrypting and decrypting the text. Next → ← prev Vigenere Cipher Introduction
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