When it comes to digital security, very few certifications carry the weight and prestige of Common Criteria EAL6+.
Whether you're exploring secure hardware, cryptographic chips, or evaluating the safety of critical systems, EAL6+ stands as a mark of extraordinary assurance — far beyond what most consumer devices ever achieve.
In this article, we break down what CC EAL6+ really means, why it matters, and where it’s used.
🧩 What Is Common Criteria (CC)?
Common Criteria (ISO/IEC 15408) is an international standard used to evaluate the security assurance of IT products.
Instead of focusing only on what security features a product claims to have, CC evaluates how securely those features are designed, implemented, and tested.
Common Criteria uses Evaluation Assurance Levels (EAL1–EAL7) to measure this depth of analysis.
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🏆 What Does EAL6+ Mean?
EAL6 (Evaluation Assurance Level 6) is one of the highest ratings possible, requiring formal methods, advanced testing, and deep inspection of system internals.
The “+” means additional protections above the standard EAL6 requirements — often related to tamper resistance, lifecycle security, or attack mitigation.
In simple words:
EAL6+ is designed for systems that must withstand extremely sophisticated attacks — often from state-funded, highly skilled adversaries.
🆙 EAL Levels at a Glance
| Level | Description | Typical Use |
| EAL1 | Functionally tested | Low-risk consumer software |
| EAL2–EAL3 |
Methodically tested | Standard commercial products |
| EAL4 | Methodically designed, tested, reviewed | Enterprise-level systems |
| EAL5 | Semi-formal design & testing | Secure elements, smart cards |
| EAL6 | Semi-formal & formal verification | Military & intelligence |
| EAL6+ |
EAL6 + enhanced security requirements | High-security cryptographic modules |
| EAL7 |
Fully formal design | Ultra-sensitive government systems |
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🔒 What Makes EAL6+ So Strong?
To achieve EAL6+, a product must undergo extremely rigorous evaluations, including:
🧠 1. Formal and Semi-Formal Security Design
Parts of the product’s design must be expressed in mathematical models, reducing implementation flaws.
🔍 2. Advanced Vulnerability Analysis
Evaluators try to break the system using:
Power analysis (SPA/DPA)
Fault injection
Laser attacks
Glitching attacks
Side-channel analysis
Electromagnetic leaks
These techniques are the same used in military-grade labs and advanced hacking operations.
🧪 3. Deep Penetration Testing
Independent labs simulate well-funded attackers to test the real-world resilience of the system.
🏭 4. Supply-Chain Verification
The manufacturer must prove:
Secure manufacturing
Secure key handling
Trusted firmware signing
Controlled distribution
📦 5. Strict Lifecycle Security
EAL6+ also evaluates:
Secure development environment
Secure updates
Incident response capacity
Flaw remediation (higher levels often include ALC_FLR requirements)
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➕ What the “+” Actually Means
The + represents additional security requirements beyond base EAL6.
These may include:
Enhanced vulnerability analysis ( AVA_VAN.5)
Strict flaw remediation (ALC_FLR.1 or above)
Advanced testing requirements
Extra tamper-resistance features
In many cases, the “+” is what makes the certification suitable for high-risk national security applications.
🧭 Where Is EAL6+ Used?
EAL6+ is extremely rare because it requires years of evaluation and millions in testing. Products that reach this level are typically deployed in:
🛡 Government & Military
Secure communications systems
Classified data storage devices
High-security encryption modules
🏦 Banking & Finance
Advanced smart card chips
Banking-grade secure elements
Hardware security modules (HSMs)
🧬 Critical Infrastructure
Power grid control systems
Defense communication nodes
Nuclear monitoring equipment
🔐 High-Security Cryptographic Hardware
Some specialized secure elements used in banking and military contexts reach EAL6+ tamper resistance.
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🎯 Why EAL6+ Matters
EAL6+ exists for situations where:
✔ A breach could endanger national security
✔ Attackers may use highly advanced tools
✔ Hardware must resist physical extraction attempts
✔ Traditional software-only security is not enough
In these scenarios, EAL6+ provides unmatched assurance.
💡 Final Thoughts
Common Criteria EAL6+ represents one of the highest and most respected security certifications on the planet.
It’s far beyond what typical consumer devices require, and achieving it is a monumental challenge.
However, for environments where the stakes are extremely high — military communications, secure cryptographic chips, and critical infrastructure — EAL6+ provides elite-level security designed to withstand even the most well-funded, sophisticated attacks.
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Nearchos Nearchou
Nearchos Nearchou is a determined person and 1st Class BSc (Hons) Computer Science and MSc Cyber Security graduate. He is a big tech-lover and spent several years exploring new innovations in the IT field. Driven by his passion for learning, he is pursuing a career in the Cyber Security world. Passionate about learning new skills and information that can be used for further personal and career development. Finally, he is the author of the book “Combating Crime On The Dark Web”.
