Industrial control systems are built to run for 15 to 25 years — long enough that today's encryption may not survive the systems it protects. In this byline for Computer&Automation, KOBIL CEO İsmet Koyun makes the case for hybrid cryptography as the pragmatic response: pairing classical algorithms with post-quantum methods so that OT environments gain quantum resistance without a full architectural overhaul. He outlines a four-step path — crypto inventory, prioritization, quantum-readiness as a selection criterion, and crypto-agility — and points to KOBIL's own quantum-ready connection handshake as a working example of the approach.