GDPR emphasizes "Data Protection Privacy By Design and Default," which shares similarities with the security development lifecycle (SDL) concept of "Secure By Design, By Default and In Deploy." While GDPR requires "privacy by design" explicitly, it does not use the term "secure by design." To effectively implement both privacy and security by design, organizations can start with threat modeling to identify potential vulnerabilities and then conduct a privacy impact assessment (PIA) to understand how data is being used and recommend mitigations. Integrating these two approaches holistically can help anticipate future threats and ensure compliance with GDPR regulations.