Secret Message
Mini Games
Passphrase encrypt/decrypt, plus a Caesar decoding challenge.
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About this app
Encrypt a note with a passphrase so only someone who knows it can decrypt—plus HEX/rune/Morse-styled looks and easy copy/share of the ciphertext.
Not a substitute for serious secure messaging: it’s for playful secret notes and feeling how ciphers work, with a Caesar challenge included.
What you can do
- Passphrase encrypt/decrypt in the browser
- Visual themes and a decrypt animation
- Copy ciphertext and share-ready text
- Caesar puzzles with shift control and frequency cues
Getting started
- Create a secret: message + passphrase → encrypt → copy/share.
- The recipient pastes into Decrypt with the same passphrase.
- Or play the Caesar challenge to set or solve a puzzle.
Tip
The passphrase isn’t stored or sent by this app—share it out of band. Use real secure tools for anything truly sensitive.
Last updated
July 8, 2026
Compatible devices
- Smartphone
- Tablet
- Windows
- Mac