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Encryption Generator

Encrypt and decrypt text with three educational ciphers: Caesar (shift), Vigenère (keyword) and XOR (Base64 output). All run locally. Important: these are classical ciphers for learning and games. They are not secure for real data.

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How it works

Caesar applies a shift mod 26 on letters only. Vigenère shifts each letter by the matching key letter (cycling). XOR XORs each input byte with the key bytes and serializes the result as Base64. None of these is a substitute for AES or ChaCha20.

How to use it

  1. Paste the text

    Drop in the message to encrypt or decrypt. These are educational ciphers, never use them for real secrets.

  2. Pick the cipher

    Caesar shifts letters by N. Vigenère shifts by a keyword, cycling. XOR XORs each byte with the key and emits Base64.

  3. Set shift or key

    Caesar takes a number 1 to 25. Vigenère and XOR take a keyword. Same parameters reverse the operation when decrypting.

  4. Copy the cipher output

    Take the result into a CTF flag, a puzzle book, an escape-room clue, or a workshop where you teach how each cipher breaks.

Use cases

Teach how classical ciphers work in a workshop.

Build a CTF or escape-room challenge.

Generate scrambled text for a puzzle book.

Decode a Caesar-shifted note from a friend.

When NOT to use it

  • For protecting any data that matters. Caesar, Vigenère and XOR are educational ciphers with known attacks; modern attackers break them in seconds.
  • When you need integrity (knowing the ciphertext was not tampered with). These ciphers have no MAC. Use AES-GCM or ChaCha20-Poly1305.
  • When the same plaintext is encrypted twice with the same key. These ciphers leak that fact. Real ciphers use a unique nonce per message.

Your data never leaves your browser

Every utility runs entirely on your device. Nothing is uploaded, nothing is stored on a server. You can disconnect from the internet and they keep working.

Frequently asked questions

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