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Vigenère Cipher Encode and Decode Online


How to handle characters that are not in the alphabet
Vigenère Cipher Encode and Decode Online-summary

Online vigenère cipher encryption and decryption tool, supporting vigenère cipher encryption for text and decryption of vigenère ciphertext. The characters that support encryption include English lowercase letters, English uppercase letters, and Chinese characters.

Vigenère Cipher Encode and Decode Online-instructions

The Vigenère cipher (vigenere cipher) is an encryption algorithm that uses a series of Caesar cipher passwords to form a password alphabet, which is a simple form of multi table password. The alphabet used by this tool to encrypt and decrypt Vigenère cipher is [a-zA-Z\u4E00-\u9FA5].
Note : The result of Vigenère encryption depends on the alphabet and key used for encryption. This tool uses a relatively broad alphabet to support encryption of more characters.

  1. Input Content : Enter the text to be encrypted or the ciphertext to be decrypted.
  2. Key : The key used for encryption and decryption. For text encrypted with a key, the same key needs to be used for decryption. The key requirement is to consist entirely of characters from the alphabet.
  3. Other Char : This tool supports Vigenère cipher encryption for English lowercase letters, English uppercase letters, and Chinese characters (\u4E00 - \u9FA5). Characters that are not within this range can be retained or deleted.
  4. Encode : Encrypt the input text with a Vigenère cipher.
  5. Decode : Perform Virginia decryption on the input ciphertext.
  6. Vigenère Cipher Alphabet
    a ... z A ... Z ...
    a a ... z A ... Z ...
    ... ... z A ... Z ... a
    z z A ... Z ... a ...
    A A ... Z ... a ... z
    ... ... Z ... a ... z A
    Z Z ... a ... z A ...
    ... a ... z A ... Z
    ... ... a ... z A ... Z
    a ... z A ... Z ...