Vigenère Cipher
Encrypt and decrypt with the Vigenère cipher online. Keyword-shifted letters, case preserved. For puzzles — not real security.
Vigenère cipher
Toy cipher for puzzles — not encryption. Use real crypto for secrets.
Output
Lxfopv ef rnhr
How to use
- Type keyword in Key.
- Paste text.
- Copy output; same key decrypts. Puzzles only, not real security.
FAQ
Is it secure?
No — broken since the 1800s. Puzzles and history lessons only.
Non-letters?
Pass through untouched; the key advances on letters only.