Vigenere Cipher Program in Java with Output for Encryption and Decryption The above procedure is repeated for all the letters in the ciphertext.įinally, we will obtain the following plaintext(original message):Īccording to Wikipedia, we can express the encryption of vigenere cipher in an algebraic equation in the following way.įor key K and plaintext P, the ciphertext C can be obtained by using the below equation:Īccording to Wikipedia, we can express the decryption of vigenere cipher in an algebraic equation in the following way.įor key K and ciphertext C, the plaintext P can be obtained by using the below equation: Now, go to row E and look for the letter 'E' in it, the corresponding column to letter E is A which is the second letter of the plaintext. Pick the second letter of key and ciphertext i.e 'E' and 'E' respectively. Now, go to row L and look for the letter 'U' in it, the corresponding column to letter U is J which is the first letter of the plaintext.Ģ. Pick the first letter of key and ciphertext, i.e 'L' and 'U' respectively. The decryption process example is given below.ġ. The above procedure is repeated for all the letters in plaintext.įinally, we will obtain the following ciphertext (encrypted text):ĭecryption is performed by going to the row in vigenere table corresponding to the key, searching the position of ciphertext letter in that row and then using the column's label as the plain text. Hence, 'E' is the second letter of the ciphertext or encrypted text. Pick the letter from the vigenere table where row E and column A coincides i.e 'E'. Check row E and column A in the vigenere table. Now take the second letter of key and plaintext, i.e 'E' and 'A' respectively. Letter at the intersection of is the enciphered letter.Ģ. Hence, 'U' is the first letter of the ciphertext or encrypted text. Pick the letter from the vigenere table where row L and column J coincides i.e 'U'. Check row L and column J in the vigenere table (i.e above table). Pick the first letter of key and plaintext, i.e 'L' and 'J' respectively. You can pick any word as a keyword which consists of alphabets only.ġ. The person sending the message picks a keyword and repeat it continuously until it matches the length of the plaintext. The plaintext is the message to be encrypted.
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