- 2018 IEEE. This paper presents an information-theoretically (unconditionally) secure approach to enhancing security of control and diagnostic applications. Unconditional (information-theoretic) security means that an attacker, even with infinite computational power, still cannot decrypt the data. Currently, only quantum key distribution (QKD) and the Kirchhoff-law-Johnson-noise (KLJN) schemes can offer unconditional security for the secure key generation/exchange, which is the difficult part to reach information-theoretic security. The key idea of this paper is to deploy the chip-integrable and equally (or more) secure KLJN approach to enhancing the security of control and diagnostic systems. We will present the high level architecture and three potential applications of our approach.