This project is in collaboration with the company ARMA Instruments, which produces a secure messaging device ARMA G1. The messaging device shall provide the highest safety achievable. It is built on a zero-trust approach from hardware and software to manufacturing. Its minimalistic hardware is designed to exclude opportunity for any type of attack and does not rely on a dedicated server infrastructure thereby hiding the physical location and the identity of the individuals using it. The present project shall concentrate on the topics Autonomous Threat Intelligence and TEMPEST resistance and hardware anti-tamper reliability.