Secure and private by design, Communicatio Secreta is an offline-first numbers-station toolkit for creating, authenticating, transmitting and recovering one-time-pad messages.
Your message content, pad material and generated audio remain on your device throughout the core cryptographic workflow. Convert text into authenticated decimal groups, display the exact transmission on screen and render it as clear synthesized speech.

Communicatio Secreta is an offline-first numbers-station toolkit for creating, authenticating, transmitting and recovering one-time-pad messages.
Convert text into authenticated decimal groups, display the exact transmission on screen and render it as clear synthesized speech. Optional radio effects can add filtering, noise, hiss and fading without changing the underlying digit sequence.

FEATURES

• Generate directional SEND and RECEIVE one-message pad packages
• Encrypt text using decimal one-time-pad arithmetic
• Authenticate complete transmissions with one-use authentication material
• Verify pad identity, direction, sequence, length and message integrity
• Reject previously consumed pads and replay attempts on the local device
• Display exact digit groups alongside synthesized spoken numbers
• Pause, seek and replay generated transmissions
• Save transcripts and audio in password-protected encrypted containers
• Import and recover compatible transmissions locally
• Use the cryptographic workflow without uploading message content

PRIVACY

Message text, one-time-pad material, generated audio and encrypted transmission files are processed locally on your device. They are not sent to the developer unless you explicitly choose to transfer or share a file.
Internet access is used for membership authentication, subscription management and other user-initiated online functions. The application does not contain advertising or third-party analytics.

MEMBERSHIP

An active Communicatio Secreta membership is required to access the station interface. Subscriptions purchased through the Android application are managed through Google Play.

IMPORTANT SECURITY INFORMATION

One-time-pad confidentiality depends on every pad being generated securely, kept secret and used exactly once. Never copy, reuse, restore or share pad material between directions. The local consumption ledger cannot detect copies used on another device.

Communicatio Secreta has not received an independent cryptographic or implementation audit. It should not be relied upon for emergency, life-safety or other high-value communications. Review the included documentation and security limitations before using the application.