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VIGENERE CIPHER

VIGENERE ENCRYPT

VIGENERE DECRYPT

VIGENERE CIPHER

The Vigenere cipher is a method of encrypting alphabetic text by using a series of different Caesar ciphers You have to look for the intersection between letters I - L = T ... .N - A = N ...etc.... In the Vigenere Square (below)

EXAMPLE

Suppose that the plaintext to be encrypted is: ATTACK AT DAWN The person sending the message chooses a Keyword LEMON and repeats it until it matches the length of the plaintext. Plaintext: ATTACKATDAWN Key: LEMONLEMONLE     By looking at the letter in row L and column A of the Vigenere Square you can obtain the enciphered letter Ciphertext: LXFOPVEFRNHR

VIGENERE SQUARE



MORE EXAMPLES

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MESSAGE:      IN   TE   DOMINE   SPERAVI   NON   CONFUNDAR   IN   AETERNUM KEY:    LATIN

MESSAGE: KEY: CIPHERTEXT.

I N L A T N

T E T  I M M

D O M I N E N L A T  I N Q Z M B V R

S P E R A V I L A T  I N L A D P X Z N G I

N O N T  I N G W A

C O N F U N D A R L A T  I N L A T  I N O G N H Y D T Z

I N N L V Y

A E T E R N U N A T  I N L A T  I A X B R C N N U

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MESSAGE:          P A R I S   V A U T   B I E N   U N E   M E S S E KEY:    LOUP

MESSAGE: KEY: CIPHERTEXT.

P A R I S L O U P L A O L X D

V A U T O U P L J U J E

B I  E N O U P L P C T Y

U N E O U P I H T

M E S S E L O U P L X S M H P

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MESSAGE:          L E   C H I F F R E   I N D E C H I F F R A B L E KEY:    C I P H E R

MESSAGE: KEY: CIPHERTEXT.

L E C I N M

C H I F F R E P H E R C I P R O M W H Z T

I N D E C H I F F R A B L E H E R C I P H E R C I P H E P R U G K W P J W T I Q S I

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