This course delves into cybersecurity design principles, emphasizing secure program and system design fundamentals. Topics cover principles like Separation of Duties, Encapsulation, and Modularity, promoting design simplicity and minimizing complexities. It explores Open Design, Complete Mediation, Layering, and Defense-in-Depth strategies. Students learn about system security levels, access privileges, Fail Safe Defaults, Fail Secure approaches, Least Astonishment, Minimizing Trust Surface, and ensuring secure design aligns with usability. Trust Relationships and secure coding patterns for robust cybersecurity design are also explored