@Bredroll@mas.to secret chats support end-to-end (E2E) encryption and self-destructing messages. The algorithms used are well-known: AES, RSA, with Diffie–Hellman secure key exchange. Secret chats do not use the cloud and are saved only on the smartphones involved in the conversation. Still, some privacy features are opt-in, you may want to configure the app before using it. I'm attaching you the schematic. 🙂