About The Vigenère & Autokey Cipher Tool
The Vigenère cipher is a classic method of encrypting alphabetic text by using a series of interwoven Caesar ciphers based on the letters of a keyword. This tool enhances this classic cipher by also including the **Autokey cipher**, a variant where the key is extended with the plaintext itself, making it significantly more secure against cryptanalysis.
Key Features:
- Dual Cipher Modes: Choose between the standard **Vigenère cipher** and the more secure **Autokey cipher**.
- Encrypt & Decrypt: Easily switch between encrypting your plaintext and decrypting a ciphertext.
- Character Handling: Decide whether to keep non-alphabetic characters (spaces, numbers, symbols) in the output or remove them for a clean ciphertext.
- Case Control: Choose to preserve the original letter case, or force the entire output to be uppercase or lowercase.
- Real-time Transformation: The output updates instantly as you type or change any option.
How to Use:
- Enter the text you want to transform in the "Input Text" box.
- Provide a keyword in the "Keyword" field. Only letters are used.
- Select "Encrypt" to encode or "Decrypt" to decode.
- Choose your preferred "Cipher Type" (Vigenère or Autokey).
- Set your preferences for "Non-Alphabetic Handling" and "Output Case".
- The transformed message will instantly appear in the "Output Text" box.