Security Design: The process and practice of planning and creating systems, applications, and infrastructure with security as a central concern. Security design encompasses a range of activities, from the initial conceptualization of a system to detailed architecture and implementation. It involves identifying potential threats, defining security requirements, and selecting appropriate security controls to mitigate risks to an acceptable level. Good security design aims to achieve a balance between security measures and usability, ensuring robust defense against attacks while maintaining functionality and performance. It incorporates principles such as least privilege, defense in depth, and redundancy and is an essential aspect of developing secure IT systems and applications.