Numbers Station 12+

Numbers Station uses the same encryption technique used by spy agencies’ “numbers stations” and is the only messaging app that protects you from all of today’s and tomorrow’s threats.

Protect Against Quantum Computer Decryption
Numbers Station’s quantum safe end-to-end encryption ensures your messages cannot be intercepted today and decrypted in the future by a hostile government's quantum computing program. End-to-end encryption means only the sender and recipient can decrypt the message, not Numbers Station or anyone else. No other messaging app offers this level of protection. Unbreakable encryption today and tomorrow.
The Numbers Station app offers a total of three independent layers of encryption:
Inner layer: Quantum safe, end-to-end (optional to use)
Middle layer: State-of-the-art, end-to-end
Outer layer: State-of-the-art, app-to-server

Prevent Remote Exploitation of Your Device
There is a global spyware industry that does nothing but sell the ability to remotely exploit or hack your devices. The spyware collects your messages, contact lists, GPS, data from other apps and even uses your device's microphone to eavesdrop. Other messaging apps can be exploited by sending malicious messages to the victim from an unknown address. Victims do not see these messages nor know that they have been exploited. The use of this spyware against human rights activists, journalists and regular citizens is dangerous and even lethal. Numbers Station has hardened its security from these exploitation techniques. For example, Numbers Station offers the ability to quarantine incoming messages, such as those from unknown users. These messages will not be processed so exploitation is prevented and the user is aware a message was received. Suspicious-looking quarantined messages, such as ones from an unknown address, can be submitted to Numbers Station for further analysis. Numbers Station will alert you if the message is deemed malicious. Numbers Station is the only messaging app to offer this service.

Protect Your Identifying Information and Contacts Information
Numbers Station does not require a phone number, e-mail address, social media account or any personally identifying information to create an account or use the app. Numbers Station knows nothing about you. When you purchase a subscription, Numbers Station does not receive any details about you, Numbers Station only knows that the subscription is active.
Numbers Station uses randomly generated addresses, like nLsYL1QOt5NcrOJ3Vwxpj90uTju2. Unique addresses assigned to each user are not available to anyone except through direct sharing by the user with others. Addresses can be shared in person via optional QR code scanning, which also securely shares the material required for quantum safe encryption. Other apps permit other users and potential hackers to search for your email address or phone number. Create different random addresses to use with different contacts, to further protect yourself from metadata analysis.

Maintain the Physical Security of Your Device
If your device were to be seized, out of your hands while using it, your data is accessible because your device is already unlocked. To protect against this, Numbers Station offers encryption and password protection for the app itself, protecting all user data (messages, files, images) even when the device is unlocked. Numbers Station is the only messaging app that uses the Secure Enclave, a security co-processor built-in to your device, to create and store the encryption keys that are combined with your password to protect this data. These encryption keys are never accessible outside of the Secure Enclave, not even to Numbers Stations or an attacker with full physical access to the device. No offline password cracking is possible either.

NOTE: To send messages requires an active paid subscription via an in-app purchase, receiving is free.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/