Looks like a chat, works like a safe
Secret Keeper encrypts on your device and produces a self-contained envelope.
Send it through any messenger, email or forum - only the people it is addressed to can read it.
How to get started
1. Install Secret Keeper
No servers or accounts: instead of an account, a key created on your device; its public part is your address for messaging.
2. Exchange addresses
That is how a chat starts: send your address through any messenger and add your contact’s address to Secret Keeper.
3. Write almost like in a regular chat
The message is encrypted into an envelope: tap Copy or Share and pass it through any channel. Your contact sees only a block of characters and opens it in their Secret Keeper.
4. Or chat online!
In messengers with Secret Keeper support everything is automatic: you just write, and envelopes are sealed and opened for you.
Tetatet Chat 
WebMoney Keeper 1. What is Secret Keeper?
Looks like a chat, works like a safe.
2. Exchange addresses: that is how a chat starts
Share your address
Open Secret Keeper and send your address through any messenger.
In a messenger it may look like this
Add a contact’s address
Got a message like this? Copy it whole, open Secret Keeper and tap in the chat list.
3. Write almost like in a regular chat
The message is encrypted into an envelope. Tap Copy or Share on the bubble and pass the envelope through any channel.
In the messenger, your contact sees only the envelope: a block of characters that reveals nothing. They open it in their Secret Keeper.
4. Or chat online!
Copy-paste is a workable way to chat, but not the most convenient one.
In messengers with Secret Keeper support everything is automatic: you just write, and envelopes are sealed and opened for you.
Why Secret Keeper
No servers, no accounts
Your address is your public key - sk1…, about 60 characters. No registration, no phone number, nothing stored in a cloud. The whole identity is restored from 12 BIP-39 words.
A self-contained envelope
X25519 key agreement plus XChaCha20-Poly1305. Every envelope carries a key slot for each recipient - and for you, so your own history stays readable. Deliver it over any channel.
Files of any size
Files are encrypted into the .skf container in streaming chunks: a movie encrypts as easily as a note, and truncation or chunk reordering is detected.
Everything stays local
Contacts and history live only on your device. Backup is a single encrypted .skb archive that only your key opens.
If the phone ends up in the wrong hands
The vault is locked with a PIN or biometrics. The rest is designed for pressure, not just for loss.
Wipe on brute force
A configurable number of wrong PIN attempts erases the vault.
Duress PIN
A second PIN that opens an empty profile - or silently wipes the real one.
Clipboard hygiene
Copied secrets are cleared from the clipboard after a timeout.