Vigenère Cipher
Encrypt or decrypt text with the Vigenère keyword cipher.
Note: The Vigenère cipher shifts each letter by the corresponding letter of a repeated keyword. Case is preserved and non-letters pass through. It is a polyalphabetic cipher and not secure for modern use.
What Is a Vigenère Cipher?
The Vigenère Cipher tool encrypts and decrypts text using a polyalphabetic substitution where each letter is shifted by a different amount determined by a repeated keyword. Invented in the 16th century, it was famously considered unbreakable for over 300 years.
How to Use This Vigenère Cipher
- 1Enter KeywordType a word made of letters that drives the shifts.
- 2Enter TextType the plaintext or ciphertext.
- 3Choose DirectionClick Encrypt or Decrypt to transform the text.
Frequently Asked Questions
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