The principle, formalized in initiatives like CISA’s Secure by Design and NIST’s Secure Software Development Framework, shifts responsibility toward manufacturers and builders: secure defaults, elimination of vulnerability classes, transparent patching, and evidence of security practice — instead of shipping risk for customers to mitigate.
Key points
Process over sloganThreat modeling, secure defaults, memory-safe choices, dependency management, and security testing inside development — not a review at the end.
Procurement evidenceVendor evaluations should request secure-by-design evidence: SBOMs, vulnerability-disclosure policies, security roadmaps, and how the vendor handles its own defects.
Important limitation“Secure by design” describes intent and process, not outcome. A product designed securely can still ship exploitable defects, be misconfigured, or be operated unsafely — design quality reduces but does not remove operational risk.