At e4ds Tech Day 2026, Sim Sang-gyu, CTO of Autocrypt, explained automotive cybersecurity strategies in the era of Physical AI and SDV (Software-Defined Vehicle). Automobiles are evolving as part of an ecosystem connected to AI, cloud, chargers, IoT, and robots, and he emphasized that the scope of security must expand beyond the vehicle interior to the entire connected environment. In particular, AI model tampering, adversarial attacks, OTA updates, and EV charger hacking were identified as major threats. He explained that response measures require zero trust, AI model integrity protection, intrusion detection, Security by Design and Default, and full lifecycle security management, and that proactive security system establishment beyond regulatory compliance is critical for securing future mobility competitiveness.