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Quantum isn’t a distant sci‑fi threat—it's shaping security decisions right now. We open with what NIST’s new post‑quantum FIPS 203/204/205 actually mean for your crypto roadmap, why “harvest now, decrypt later” raises the stakes for long‑lived data, and how the 2035 federal mandate will ripple through contractors, audits, and CMMC. Then we get practical, translating policy pressure into the access decisions you make every day and the concepts you’ll see on the CISSP exam.

We break down mandatory access control (labels, clearance, strict need‑to‑know), discretionary access control (owner grants, permission creep), role‑based access control (job functions, least privilege at scale), attribute‑based access control (context, dynamic conditions), and rule‑based control (fine‑grained logic and exceptions). Along the way, we highlight the keywords that unlock tricky multiple‑choice items—“classification,” “owner,” “job role,” “attributes,” “rules”—so you can map questions to the correct model fast. More importantly, we explain how to combine models without creating chaos: use RBAC for baseline entitlements, layer ABAC for context and risk signals, lean on rule-based policies for surgical exceptions, and reserve MAC for highly classified domains where enforcement must be absolute.

If attackers are stockpiling ciphertext for a quantum tomorrow, the answer is a two‑track plan: crypto agility to adopt quantum‑resistant algorithms and disciplined access governance to limit blast radius today. We share actionable cues for exam success, practical design tips for avoiding privilege escalation, and a reminder that good security is repeatable security—clear roles, auditable policies, and continuous review.

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