The Vigenère

 Welcome back! Today, we're unraveling a new cipher with our Code of the Day.

The Encrypted Message:


SNCRDSZR SGQDDQ ZDR QDRS ENQ VQDDSHMF



Background:

Today's cryptographic challenge uses the Vigenère Cipher, a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution. This cipher was named after Blaise de Vigenère, a French diplomat. It employs a keyword to determine the shift for each letter, integrating the simplicity of the Caesar Cipher with a more robust and unpredictable approach.


Decoding Instructions:

  1. Identify the Keyword: The keyword is repeated until it matches the length of the message. For example, if the keyword is "KEY", it would be repeated like this: KEYKEYKEYK.
  2. Determine the Shift: Each letter of the keyword corresponds to a shift value, where 'A' shifts 0, 'B' shifts 1, and so on. For "KEY", 'K' represents a shift of 10, 'E' represents 4, and 'Y' represents 24.
  3. Apply the Decryption: For each letter in the encrypted message, reverse the shift determined by the corresponding letter in the keyword. This means subtracting the shift value from each letter's position.
  4. Reveal the Message: Once you've applied the reverse shift to each letter, the original message will be revealed!

We’re keeping things intriguing today! Share your solutions in the comments and let’s see who can crack the code first. The solution will be revealed in our next post.

Check back for more Crypto!


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