Security of H4SD3

H4SD3 plays a vital role in building enterprise security perimeters, making its own security a priority. APT incidents in recent years have shown that attackers often exploit vulnerabilities in high-privileged security devices, using them as launch points for deeper intrusions into protected networks. Existing defense technologies can mitigate known cyber threats, but they fall short against unknown attacks. Ensuring the security and resilience of H4SD3 under resource constraints has become the central challenge. In this chapter, we propose the behavior-aware lockdown protection mechanism and multirole heterogeneous observation chains. We show how these mechanisms counter unknown cyberattacks and reinforce the overall security of H4SD3.