Secret Keeper

Secret Keeper is a standalone end-to-end encryption tool. It turns any

communication channel into a secure one: encrypt a message or a file, send

the result over a regular messenger or e-mail, or show it as a QR code —

only the intended recipient can decrypt it.

NO SERVERS, NO ACCOUNTS

• The app is fully offline: no sign-up, no phone number, no e-mail.

• Keys are generated on your device and never leave it.

• We collect no data at all — there is simply nowhere to send it.

CRYPTOGRAPHY

• Modern standard algorithms: X25519 + AES-GCM.

• Your identity is a 12-word seed phrase: it restores your profile on a

new device.

• Your address is a short string / QR code that is safe to share openly.

• The envelope format is open and documented (secretkeeper.net).

ACCESS PROTECTION

• PIN code and biometrics (Face ID / Touch ID / fingerprint).

• Duress PIN: a separate code that opens an empty profile.

• Automatic wipe after several failed PIN attempts.

• Locks when the app goes to background; screenshot protection (can be

turned off).

MESSAGING AND FILES

• Offline chats: per-contact message history, stored encrypted.

• Encrypt files of any type (.skf) — photos, videos, documents.

• Backup is a single encrypted file (.skb): its contents can only be

opened with your seed phrase.

INTEGRATIONS

• Tetatet Chat: link the apps and secret messages get delivered online

automatically.

• The Secret Keeper browser extension encrypts right on websites.

• Passwordless sign-in to services via QR (SK Login).

WHO IT IS FOR

Anyone who values privacy: personal correspondence, passwords and codes,

documents, medical and financial data. Secret Keeper requires no trust in

a middleman — verifiable cryptography instead of promises.

Open protocol specification: https://secretkeeper.net/protocol

Privacy policy: https://secretkeeper.net/privacy