Episode 45 — Secure the software lifecycle end-to-end: design, build, deploy, and operate safely
Before we continue, a quick note: this audio course is a companion to our course companion books. The first book is about the exam and provides detailed information on how to pass it best. The second book is a Kindle-only eBook that contains 1,000 flashcards that can be used on your mobile device or Kindle. Check them both out at Cyber Author dot me, in the Bare Metal Study Guides Series.
Security requirements have to be set early, because the earliest decisions constrain everything that follows. Requirements should be aligned to business risk, meaning they reflect what the organization cannot afford to lose, what trust boundaries must be protected, and what regulatory or contractual obligations must be honored. A useful way to think about requirements is that they are guardrails, not wish lists, and guardrails are only effective when they are concrete and testable. If a requirement says protect customer data, you need to define what protection means in terms of access control, encryption, monitoring, and retention. If a requirement says maintain availability, you need to define objectives and the supporting resilience mechanisms, because availability is not achieved by intention. Requirements should also account for the threat environment, because the attack patterns that matter for a public-facing service differ from those that matter for a constrained internal tool. The point of early requirements is to prevent expensive rework, because retrofitting security after architecture and workflows are set is often far more painful than shaping them from the start. When requirements are explicit, teams can make tradeoffs intelligently instead of discovering conflicts during incident response.
