One Time Pad

RRiVEN LLC

Contains ads

About this app

One Time Pad lets you encrypt and decrypt messages using true one-time pad encryption — the only mathematically proven unbreakable cipher.

You and your contact agree on a shared secret key
Type your message and key to encrypt
Share the encrypted message via text, email, DM, or post it publicly on OneTimePad.app
Your contact decrypts using the same key

Features

Encrypt and decrypt messages instantly
Supports A-Z, 0-9, and spaces
Post encrypted messages publicly on OneTimePad.app
Tap a link from OneTimePad.app to auto-fill and decrypt
Share encrypted messages to any app
No account required — no sign-up, no email
No data collection — your keys and messages never leave your device
Minimal permissions — no internet access required for encryption

Why One Time Pad?

Unlike modern encryption that relies on mathematical difficulty, OTP encryption is information-theoretically secure. A ciphertext can decode to any possible message of the same length, making brute force meaningless. As long as your key is random, at least as long as your message, and never reused — the encryption is unbreakable.

Web Integration

Visit https://OneTimePad.app to encrypt and decrypt in your browser, view public messages, and share links that open directly in the app.
Only requests vibrate permission.

What's New (Release Notes)

Redesigned OneTimePad.app with new dark theme
Deep links now auto-fill the decrypt field
Bug fixes and performance improvements

Ratings and reviews

What’s the point of using XOR encryption if the key can’t be set as random binary data and is limited to letters and numbers? The developers clearly don’t understand cryptography. The app is not only useless but can be harmful in many cases.

It doesn't let me set or change a username. I always get an error Message. So this app seems to be rather useless. Especially in the light that there is no manual or help function

Very simple app that uses the principles of one time pad encryption. No permissions makes it even better. 4 stars because it is basic and no user guide

What’s new

Fix Android 16 edge-to-edge