Vigenère Cipher Tool
Encode and decode text using the Vigenère cipher, a classic polyalphabetic substitution cipher that uses a keyword to encrypt and decrypt messages.
Key length: 0 characters (only letters will be used)
Characters: 0
Characters: 0
About Vigenère Cipher
What is Vigenère Cipher?
The Vigenère cipher is a polyalphabetic substitution cipher that uses a keyword to encrypt text. Each letter is shifted by a different amount based on the corresponding letter in the keyword.
How it Works
- • Uses a repeating keyword
- • Each letter shifted by keyword letter
- • Non-alphabetic characters unchanged
- • Case preserved in output
Historical Context
Invented by Blaise de Vigenère in 1586, this cipher was considered unbreakable for centuries and was called "le chiffre indéchiffrable" (the indecipherable cipher).
Features
- • Encode and decode modes
- • Random keyword generation
- • File upload support
- • Case preservation
- • Client-side processing