The Secure Software Development Lifecycle integrates security activities into every development phase: security requirements during planning, threat modeling during design, secure coding practices and code review during development, security testing (SAST, DAST, manual penetration testing) during testing, secure deployment practices, and security monitoring in production. The 'shift left' approach catches vulnerabilities earlier when they're cheaper to fix — but penetration testing remains essential as the final validation that all other security activities actually produced a secure application.
Technical
Secure Software Development Lifecycle (SSDLC): Integrating Security at Every Phase
Security at every development phase — from requirements to deployment. Building security into the SDLC instead of testing it in at the end.