CISSP Mnemonics Cheat Sheet:
Thor’s Guide to All 8 Domains
The ultimate memory cheat sheet — decoded, domain-mapped, and designed for daily review. My personal road to CISSP starts here.
Every CISSP candidate hits the same wall: 8 domains, hundreds of frameworks, models, and acronyms — and an exam that tests whether you truly understand them, not just recognize them. This CISSP mnemonics cheat sheet helps you remember all 8 domains using Thor’s Mnemonics — a battlefield reference created by security educator Thor Pedersen. Memorization alone won’t cut it, but without a strong memory foundation, deep understanding can’t take hold either. Treat this page as your daily 5-minute warm-up: read through it every morning before your study session, and watch these concepts move from short-term recall into long-term memory. Bookmark it now and come back tomorrow.
Why Mnemonics Actually Work for CISSP
The CISSP exam covers 8 domains, hundreds of frameworks, models, protocols, and attack types. Trying to brute-force memorise all of it is a recipe for burnout. Mnemonics work because they hijack how your brain stores information — they attach abstract sequences to vivid, memorable images or phrases your brain already knows how to hold.
Thor Pedersen (thorteaches.com) has spent years building the most effective mnemonic system for CISSP. In this article, I’ve taken every mnemonic from his cheat sheet and organised them by domain, explained the logic behind each, and added context so you understand why the mnemonic maps to the concept — not just the acronym itself.
How to use this article: Don’t try to read all 8 domains in one sitting. Bookmark this page. Spend 5 minutes each morning on one domain. By the end of 8 days, you’ve touched every domain. Then cycle again.
CISSP Exam Domain Weights
Not all domains are equal on the exam. Before we dive into mnemonics, know where the marks live:
Domain 1 carries the highest weight at 16%. That means every mnemonic in Domain 1 is worth double the effort. But don’t neglect the rest — IAM, Architecture, and Operations together account for nearly 40% of the exam.
Security & Risk Management Exam Heavy
Ethics, governance, risk analysis, legal frameworks, and security policies. The “thinking” domain — heavy on concepts, frameworks, and formulas.
Opposite:
Due Care = Act on it, correct the problem (the “C” matches)
SLE = Single Loss Expectancy (AV × EF)
ARO = Annualised Rate of Occurrence
AV = Asset Value · EF = Exposure Factor
SleAVEF: Mario says “I’ve got something up my sleav-ef” — SLE = AV × EF. The formula chain: know your asset value (AV), calculate how much you’d lose per incident (EF %), that gives you SLE — then multiply by how often it happens per year (ARO) to get ALE. That’s how much you should budget for countermeasures — never spend more on a control than the ALE.
Asset Security
Data classification, ownership, retention policies, and data handling requirements. Know your labels — they appear on scenario questions constantly.
Domain 2 is about who is responsible for data. Remember the key roles: the Data Owner (executive level, decides classification), the Data Custodian (IT, implements controls), and the Data User (follows policy). The exam loves to ask “who is responsible for classifying data?” — answer: the owner, not IT.
Security Architecture & Engineering
Security models, cryptography, physical security, hardware architecture, and secure design principles.
Star Property (No Write Down): Cannot write data to a lower level
Strong Star: No read or write across levels — most strict
Star Integrity (No Write Up): Cannot write to a higher integrity level
Invocation Property: Cannot invoke services at higher integrity levels
MD5, MD4 — hashing (
Block cipher: Encrypts in fixed chunks (AES = 128-bit blocks) — more secure
EAL3:
EAL5:
EAL7:
Defense in Depth
Mnemonic: Onion Defense (layering). An onion has concentric layers — each one must be peeled before reaching the core. Security works the same way: physical controls → network controls → host controls → application controls → data controls. If one layer fails, the next one holds. This concept appears in every domain on the CISSP exam — it’s the meta-strategy behind all other controls.
Communication & Network Security
OSI model, TCP/IP, protocols, network attacks, and secure communications design.
| Layer | Name | Memory Hook | Protocols / Devices |
|---|---|---|---|
| 1 | Physical | Please (P) | Cables, Hubs, Repeaters |
| 2 | Data Link | Do (D) | Switches, MAC addresses, Ethernet |
| 3 | Network | Not (N) | Routers, IP, ICMP |
| 4 | Transport | Throw (T) | TCP, UDP, Ports |
| 5 | Session | Sausage (S) | NetBIOS, PPTP |
| 6 | Presentation | Pizza (P) | SSL/TLS, JPEG, ASCII, Encryption |
| 7 | Application | Away (A) | HTTP, DNS, FTP, SMTP |
Identity & Access Management (IAM)
Authentication, authorisation, access control models, and identity lifecycle.
3D:
PR:
• Preventative — stops the attack (firewall, locks, encryption)
• Detective — finds the attack after it starts (IDS, audit logs, CCTV)
• Corrective — fixes damage (patching, restoring backups)
• Deterrent — discourages the attacker (warning banners, guards)
• Compensating — substitutes for a missing primary control
• Directive — tells people what to do (policy, training)
• Recovering — restores normal operations (DRP activation)
Exam tip: The question will describe a scenario — map the control to its type. “The company deployed an IDS” = Detective. “The policy states users must use strong passwords” = Directive.
Security Assessment & Testing
Vulnerability assessments, pen testing, audits, and DREAD/STRIDE threat modelling.
• Spoofing → violates Authentication
• Tampering → violates Integrity
• Repudiation → violates Non-repudiation
• Information Disclosure → violates Confidentiality
• DoS → violates Availability
• Escalation → violates Authorisation
Use STRIDE during the design phase — it’s a proactive framework. The CISSP exam uses STRIDE in Software Development (Domain 8) and Threat Modelling questions.
Security Operations
Incident response, forensics, BCP/DRP, change management, and cyber attack lifecycle.
Software Development Security
SDLC, secure coding, maturity models, database security, and code review frameworks.
SDLC2 (Full): Initiation · Requirements · Architecture · Design · Develop · Test · Release · Dispose
⏱ Your 5-Minute Daily Review Routine
- 1Pick one domain section per morning. Rotate through all 8 over 8 days, then cycle again.
- 2Read each mnemonic phrase aloud. Vocalising activates additional memory pathways.
- 3Cover the expansion and try to recall what each letter stands for. Click “Show Logic” only if you can’t recall.
- 4Write one sentence connecting the mnemonic to a real-world scenario you’ve encountered in your career.
- 5Flag the ones that don’t stick. Those are your exam weak spots — add them to your flashcard app.
This is just the beginning.
This article covers the foundational mnemonic layer — what to remember. Future articles in this series will go deeper: domain-by-domain practice questions, real-world case studies mapping my IT career to CISSP concepts, and a full study plan breakdown. Subscribe to IlmBytesTech to follow along as I document the full journey to passing the CISSP exam.
