The next level of confidential messaging.

Generate a unique stream cipher directly on your device and share it securely with your contact via Bluetooth.

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End-to-End Encryption that puts you in control.

Chiffr was built to provide users with a secure, private messaging platform. It addresses the growing concern over digital privacy by ensuring that all messages are encrypted locally and only shared with trusted contacts. By using encryption methods that are quantum-secure, Chiffr ensures that your messages remain private, even in the face of future technological advances.

Coming Soon

Free

Chiffr will always be free to use. Protect your privacy end-to-end at no cost.

Quantum Secure

Our secret keys are exchanged locally so the encryption is invulnerable to even a quantum attack.

Private and Local

Generate your secret keys locally and share them via Bluetooth. They are never uploaded.

You Choose

A Stream Cipher secures 4000+ messages, while AES is unlimited.

Enhanced Entropy

Boost encryption strength with randomness—choose iPhone device entropy or use an image to seed a ChaCha CSPRNG.

Open Source

We use widely trusted, publicly available algorithms. See our open-source encryption library on GitHub.

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How it Works.

Follow these steps to get started with Chiffr:

  1. Download the app and sign up with your email address. You will receive a unique username, such as "strongtrumpet281".
  2. Create a new AES Key or Stream Cipher in the Encryption tab.
  3. In the Encryption tab, select the key you generated and have your contact tap download .
  4. Once the secret key is shared, an encrypted conversation will start automatically, ensuring all messages exchanged are secure.
  5. You can repeat Steps 2 and 3 to generate and share a new key whenever you like. This will not erase your chat history.

Frequently Asked Questions

Chiffr is a secure, private communication tool that uses Bluetooth exchanged ciphers for encryption.

Yes, Chiffr is completely free to use and its encryption methods are open source.

Unless your device itself is compromised, any interceptor is theoretically incapable of deciphering your messages.

Chiffr employs quantum-resistant encryption by generating stream ciphers and AES keys locally and exchanging them securely via Bluetooth.

Current key exchange methods (e.g., Diffie-Hellman and Elliptical Curve Cryptography) rely on the difficulty of solving mathematical problems to securely establish a shared secret. Quantum computers could intercept and calculate these keys, enabling them to decrypt all communication between parties.

A cipher (SY-fur) is a binary data file shared between contacts. Each message uses a unique portion of the cipher for encryption, and it is never re-used for another message.

Exchanging a cipher or secret key ensures both parties share a secure key for encrypting and decrypting messages. By avoiding online or cloud transmission, the key remains private and fully secure.

Chiffr is a spin on "Chiffre," the French word for "cipher" or "key." It symbolizes the secure key that keeps your messages private.

Our cryptography is built on the One-Time Pad (OTP) method. Each piece of the cipher is used exactly once for each bit of plaintext message. This uniqueness is why OTP is theoretically unbreakable.

Yes, you can start a chat but the messages will not be encrypted until you share a cipher or AES Key via Bluetooth.

You need an email address to sign up, and you will be assigned a random username to interact with your contacts (e.g., being added to conversations).

Yes, when you or your contact deletes the chat history, both the messages and the ciphers will be permanently erased for both parties.

While AES encryption itself is not vulnerable to quantum attacks, the Diffie-Hellman key exchange protocol used alongside it is. We provide unlimited AES encryption powered by locally exchanged keys for enhanced security.