Written by: Androidquickguide Hardware & Systems Engineering Lab (Senior Electrical & Systems Engineering Bureau)
Fact-Checked & Reviewed by: Androidquickguide Technical Standards Review Board (Connected Systems & Power Diagnostics Panel)
Standards: Current Technical Edition | Hardware Tested & Field Verified | Independent Lab Review | Direct technical specification verification against IEEE, NEC & NIST Standards
Guidelines: Engineered in accordance with National Electrical Code NEC Article 625 and NIST Smart Grid Standards.
Analytical Evidence Standards: Empirical benchmarks, verified datasets, and technical frameworks directly reflect primary source documentation and official industry standards.
Both chips carry EAL6+ certification. Both pass AVA_VAN.5 physical attack evaluations. Knox Vault vs Titan M2 is not a tie — security boundary architecture, power isolation strategy, and fault-injection response diverge sharply enough to matter for enterprise deployments, security researchers, and anyone storing cryptographic credentials on Android hardware. This analysis compares silicon-level architecture, certification scope, and physical attack resistance using primary source documentation.
What EAL6+ Actually Means for Knox Vault vs Titan M2
Common Criteria EAL6+ is not a marketing badge. It is a structured evaluation framework requiring independent laboratory testing against documented attack vectors. AVA_VAN.5 — the vulnerability analysis component at this level , demands that evaluators actively attempt to exploit the target using high-attack-potential methods: Differential Power Analysis (DPA), Laser Fault Injection (LFI), clock glitching, and physical microprobing.
Samsung’s S3FV9RR secure element received BSI Common Criteria EAL6+ certification for Knox Vault (BSI-DSZ-CC-1110), confirming hardware resistance against side-channel leakage, laser fault injection, and thermal probing up to 100ns glitch duration. Google’s chip earned its Titan M2 Common Criteria evaluation report (BSI-DSZ-CC-1188) EAL6+ rating by passing the same AVA_VAN.5 standard, with evaluators specifically testing power analysis resistance, clock glitching, and physical microprobing via internal clock trim.
Same certification level. The physical mechanisms each chip uses to achieve that resistance are not the same, and that gap is where Knox Vault vs Titan M2 becomes a meaningful engineering question rather than a branding exercise. Certification confirms resistance was demonstrated under evaluation conditions; architecture determines how that resistance is achieved and which threat models it addresses most directly.
Architectural Divergence: How Each Chip Achieves Physical Isolation
Knox Vault: Discrete Secure Processor with Analog Defenses
Knox Vault does not live inside Samsung’s primary Exynos or Snapdragon SoC. Per the Samsung Knox Vault architectural whitepaper, the secure processor connects to the main SoC exclusively via isolated I2C/SPI bus, runs a distinct Knox Vault OS, and covers 64KB SRAM plus 512KB NVRAM under an Active Shield Mesh — a physical metal layer that detects decapsulation attempts before an attacker reaches internal circuitry.
What makes Knox Vault vs Titan M2 architecturally asymmetric is the analog sensor array. Knox Vault integrates dedicated voltage monitors and temperature sensors that trigger immediate SRAM wipe upon detecting glitch signatures, including thermal probing events within the 100ns glitch duration window documented in BSI-DSZ-CC-1110. Analog circuits respond faster than firmware, and they cannot be patched out by a software exploit that executes before the firmware boots — a property that matters when the adversary has physical hardware access and laboratory-grade fault injection equipment.
Physical bus separation also affects power analysis attack surface. Knox Vault draws power through its own supply rail rather than sharing traces with the application processor, so capturing meaningful DPA signals requires probing a physically distinct power domain. Samsung’s whitepaper describes this as logical and bus isolation with a dedicated supply stage; board-level power rail independence varies by OEM implementation and is not universally guaranteed across every Samsung device using Knox Vault. Security architects should verify per-device hardware schematics rather than treating supply isolation as categorical across all Knox Vault deployments.
Titan M2: Dedicated RISC-V Core with Internal Clock Independence
Google’s Titan M2 deploys a dedicated RISC-V core integrated into the Tensor SoC package-on-package stack. The integration specifics differ by generation: Tensor G2 (Pixel 7 series) and Tensor G3 (Pixel 8 series) both use PoP integration, but G3 revised the package configuration; Google’s per-generation Pixel security documentation should be consulted for die-level specifics rather than treating both generations as identical implementations. In both cases, Titan M2 is architecturally separate from the application processor, with its own internal memory and TRNG, but it is not a discrete PCB component with a fully independent power rail. Power domain separation operates at the package level rather than through board-level supply isolation.
Internal clock trim, cited explicitly in BSI-DSZ-CC-1188, is Titan M2’s primary countermeasure against clock glitching. By managing its own internal clock rather than deriving timing from a shared system oscillator, Titan M2 eliminates the most common class of clock manipulation attacks at the source. Power analysis resistance is achieved through algorithmic countermeasures and physical layout techniques rather than a fully independent power rail — a different engineering trade-off, not an inferior one.
One clarification on firmware transparency: Titan M2 production firmware is closed-source. OpenTitan is a separate open-source root-of-trust project targeting the Earl Grey and Darjeeling silicon families; its design principles informed Titan M2’s architecture as a matter of design philosophy lineage, not specification inheritance. Production firmware running on shipping Pixel devices is not publicly auditable. Knox Vault vs Titan M2 firmware transparency is therefore a matter of architectural documentation depth — OpenTitan’s public hardware specification gives researchers more visibility into design lineage than Samsung’s fully proprietary approach, but neither chip exposes production firmware to community audit.
StrongBox Compliance and Android CDD Section 9.11.2
Both chips implement StrongBox Keymaster, Android’s framework for hardware-backed cryptographic key operations. Android CDD Section 9.11.2 mandates that a compliant StrongBox implementation include a dedicated secure CPU, discrete RAM, internal flash storage, a True Random Number Generator (TRNG), and physical tamper resistance — all isolated from the primary application processor.
Knox Vault satisfies every StrongBox requirement through discrete silicon: 64KB SRAM and 512KB NVRAM are not shared with any other SoC component, the TRNG is internal to the secure processor, and the Active Shield Mesh provides physical tamper resistance. Titan M2 satisfies the same requirements through its dedicated RISC-V die with internal memory and TRNG, meeting the isolation mandate within its package-on-package integration. For enterprise Android deployments, StrongBox compliance is the floor. Both Knox Vault and Titan M2 clear it. The question for security architects is which chip’s physical attack resistance profile aligns with the deployment threat model above that compliance baseline.
Knox Vault vs Titan M2: Physical Attack Resistance Compared
| Attack Vector | Knox Vault | Titan M2 |
|---|---|---|
| Differential Power Analysis (DPA) | Dedicated supply stage; isolated power domain (OEM-dependent) | Algorithmic countermeasures; package-level power domain |
| Laser Fault Injection (LFI) | Active Shield Mesh + analog sensor wipe | Physical layout shielding; internal clock trim |
| Clock Glitching | Analog glitch detectors; SRAM wipe on trigger | Internal clock trim; independent oscillator |
| Thermal Probing | Analog temperature sensors; 100ns glitch duration resistance (BSI-DSZ-CC-1110) | Physical layout countermeasures |
| Physical Microprobing | Metal mesh decap detection | Layout-level countermeasures |
| Firmware Auditability | Closed proprietary firmware | Closed production firmware; OpenTitan open hardware spec (design lineage) |
| Certification | EAL6+ AVA_VAN.5 (BSI-DSZ-CC-1110) | EAL6+ AVA_VAN.5 (BSI-DSZ-CC-1188) |
| Secure OS | Knox Vault OS (dedicated) | Titan M2 firmware (RISC-V) |
| Physical Integration | Discrete die, isolated I2C/SPI bus | Package-on-package with Tensor SoC (G2/G3 configs differ) |
Platform Firmware Resiliency: NIST SP 800-193 as Architectural Reference
NIST SP 800-193 Platform Firmware Resiliency Guidelines, published 2018, establish that hardware roots of trust require discrete physical execution planes to enforce Protection, Detection, and Recovery cycles, and that defeating side-channel attacks requires independent power filtering and shielded bus interconnects. NIST SP 800-193 was developed for server and PC platform firmware; it carries no normative force in the mobile domain. Its architectural principles nonetheless map usefully onto mobile secure enclave design as an evaluation framework, particularly for organizations applying enterprise server-class threat models to high-value mobile deployments.
Knox Vault’s isolated I2C/SPI bus architecture aligns with the shielded bus interconnect principle. Its dedicated supply stage aligns with independent power filtering, subject to the OEM implementation caveat noted above. Knox Vault vs Titan M2 diverges most clearly under this framework: Knox Vault achieves separation through discrete silicon and board-level isolation mechanisms, while Titan M2 achieves equivalent resiliency goals through dedicated silicon within a PoP integration and algorithmic countermeasures.
Recovery behavior differs in ways that matter under sustained physical attack. Knox Vault’s SRAM wipe on glitch detection is hardware-enforced — analog sensor triggers memory clear before any code runs, independent of firmware coherence. Titan M2’s recovery path relies on firmware integrity checks and secure boot verification, which are robust but depend on the RISC-V execution environment remaining coherent enough to run recovery logic after a fault event. Neither approach is universally superior; the relevant question is which failure mode is more acceptable given the deployment’s physical threat model.
The Asymmetric Security Trade-Off in Knox Vault vs Titan M2
Security engineers who see matching EAL6+ ratings often assume functional equivalence. That assumption is wrong. Separating certification outcome from architectural mechanism is where the Knox Vault vs Titan M2 analysis produces actionable guidance.
Knox Vault’s closed firmware is a genuine limitation for code auditors and supply chain transparency advocates. What Knox Vault trades for that opacity is a physical attack profile that is materially harder to exploit at the board level, because analog voltage and temperature sensors that wipe SRAM on glitch detection cannot be bypassed by a software exploit, cannot be patched away by a malicious firmware update, and cannot be defeated by a DPA rig targeting a chip that shares a power domain with a high-current application processor. Discrete die architecture means an attacker pursuing board-level fault injection must contend with a physically separate power domain, not merely a logically isolated one — and the 100ns thermal probing resistance documented in BSI-DSZ-CC-1110 quantifies the speed at which that analog defense operates.
Titan M2’s architectural strength points in a different direction. Internal clock independence eliminates the most common clock glitching attack surface at the hardware level rather than through firmware mitigation. OpenTitan’s public hardware specification — even though production firmware is closed , gives the security research community more visibility into Titan M2’s design philosophy than Samsung’s fully proprietary approach provides for Knox Vault. For organizations whose primary concern is supply chain transparency and architectural review rather than board-level physical attack resistance, that visibility carries weight.
Knox Vault vs Titan M2 ultimately presents a choice between two legitimate security philosophies. High-security government and enterprise deployments facing adversaries with physical hardware access and laboratory equipment benefit from Knox Vault’s analog defense layer and discrete power domain. Organizations prioritizing architectural transparency, supply chain review, and integration with Google’s zero-trust infrastructure benefit from Titan M2’s design lineage and attestation chain.
Ecosystem Integration: Knox Vault vs Titan M2 in Enterprise Deployments
Samsung Knox wraps Knox Vault within a broader enterprise management framework including Knox Platform for Enterprise (KPE), Knox Manage, and Knox E-FOTA. Cryptographic keys protected by Knox Vault feed into Samsung’s Trusted Execution Environment (TEE) and Knox attestation chain, which enterprise MDM platforms can verify remotely. For organizations running Samsung-standardized device fleets, Knox Vault’s analog physical attack countermeasures arrive at no integration cost — they are native to the platform and do not require additional configuration to activate.
Google’s Titan M2 anchors the Pixel’s Verified Boot chain, Android Keystore hardware attestation, and Titan-based security key functionality. For organizations standardized on Google Workspace and Android Enterprise Recommended devices, Titan M2 provides a well-documented attestation chain with public key infrastructure that integrates directly into Google’s zero-trust access controls. Knox Vault vs Titan M2 in enterprise contexts should follow the MDM platform already deployed, the physical threat model of the device environment, and whether analog physical attack resistance or architectural transparency ranks higher in the security architecture.
Both ecosystems meet Android Enterprise hardware security requirements. Both chips satisfy Android CDD Section 9.11.2 at the compliance level. Differentiation lives above compliance, in the physical attack resistance profile and ecosystem integration depth each platform delivers.
Frequently Asked Questions
Which chip is better for enterprise mobile device management: Knox Vault or Titan M2?
MDM platform fit determines this more than chip architecture alone. Knox Vault integrates natively with Knox Platform for Enterprise, delivering hardware-attested key management across Samsung device fleets with remote attestation verification built into the Samsung Knox ecosystem. Titan M2 integrates with Android Enterprise Recommended certification and Google’s zero-trust access infrastructure, making it the natural choice for Google Workspace-standardized organizations. Both chips satisfy StrongBox Keymaster requirements under Android CDD Section 9.11.2, so cryptographic key isolation is equivalent at the compliance floor. Above that floor, Knox Vault adds analog physical attack countermeasures suited to high-physical-threat environments, while Titan M2 adds architectural transparency through OpenTitan’s public hardware specification and tighter native integration with Google’s attestation infrastructure. The decision should follow the MDM stack already in production, not chip preference in isolation.
How does AVA_VAN.5 evaluation actually test a secure enclave’s physical attack resistance?
AVA_VAN.5 requires certified laboratory evaluators to actively attempt to break the target using high-attack-potential methods — not merely review design documentation. For Knox Vault, BSI-DSZ-CC-1110 confirms evaluators tested laser fault injection, side-channel power analysis, and thermal probing against the S3FV9RR hardware, including thermal probing up to 100ns glitch duration. For Titan M2, BSI-DSZ-CC-1188 documents testing against power analysis, clock glitching, and physical microprobing via internal clock trim. Achieving EAL6+ means the chip resisted all evaluated attacks under laboratory conditions. It does not mean every conceivable attack was attempted, and public versions of CC reports for EAL6+ hardware routinely redact specific attack resistance parameters , so the public certification documents represent a floor of disclosed resistance, not a complete attack surface map.
What is the difference between Knox Vault’s Active Shield Mesh and Titan M2’s internal clock trim?
These countermeasures address different attack vectors and are not comparable as equivalents. Active Shield Mesh is a physical metal layer covering Knox Vault’s die that detects decapsulation — the process of chemically or mechanically removing chip packaging to expose internal circuitry for microprobing. Mesh breach triggers analog sensor response and SRAM wipe before an attacker reaches readable memory. Internal clock trim, Titan M2’s primary glitching countermeasure, prevents clock manipulation attacks by having the chip generate and regulate its own internal clock rather than accepting a potentially manipulated external signal. Knox Vault additionally deploys analog voltage and temperature sensors for fault injection detection, creating layered defense across both decap and electrical attack vectors. Titan M2’s strength lies in clock independence and package-level integration that complicates physical access without requiring a discrete die.
Does the OpenTitan project make Titan M2 firmware open source?
No. OpenTitan is a separate open-source root-of-trust project targeting the Earl Grey and Darjeeling silicon families; it is not the same as Titan M2 production firmware. Google’s Titan M2 chips in shipping Pixel devices run closed-source firmware that is not publicly auditable. OpenTitan’s contribution is a publicly documented hardware specification and design philosophy that informed Titan M2’s architecture as design lineage — not specification inheritance. Production firmware for both Knox Vault and Titan M2 is closed. The distinction on firmware transparency is therefore a matter of architectural documentation depth: OpenTitan’s public hardware specification gives security researchers more visibility into Titan M2’s design philosophy than Samsung’s fully proprietary approach provides, but neither chip exposes production firmware to community audit.
References
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Common Criteria / BSI Certification Report BSI-DSZ-CC-1110 (Samsung S3FV9RR Knox Vault)
https://www.commoncriteriaportal.org/files/epfiles/1110a_pdf.pdf
Knox Vault secure hardware element achieves Common Criteria EAL6+ under AVA_VAN.5. Hardware resists side-channel leakage, laser fault injection, and thermal probing up to 100ns glitch duration as documented in BSI certification report BSI-DSZ-CC-1110. -
Common Criteria / BSI Certification Report BSI-DSZ-CC-1188 (Google Titan M2 Security Controller)
https://www.commoncriteriaportal.org/files/epfiles/1188a_pdf.pdf
Titan M2 dedicated RISC-V core attains Common Criteria EAL6+ rating. Passes AVA_VAN.5 evaluation against power analysis, clock glitching, and physical microprobing via internal clock trim. -
Android 14 Compatibility Definition Document (CDD) Section 9.11.2 StrongBox
https://source.android.com/docs/compatibility/14/android-14-cdd.pdf
Section 9.11.2 mandates StrongBox hardware isolation from primary application processor via dedicated secure CPU, discrete RAM, internal flash, TRNG, and physical tamper resistance. -
NIST SP 800-193: Platform Firmware Resiliency Guidelines
https://csrc.nist.gov/pubs/sp/800/193/final
Published 2018. Hardware roots of trust require discrete physical execution planes to enforce Protection, Detection, Recovery cycles. Side-channel defeat requires independent power filtering and shielded bus interconnects. Developed for server/PC platform firmware; applicable to mobile secure enclave analysis as an architectural reference framework, not a normative mobile standard. -
Samsung Knox Vault Technical Whitepaper
https://images.samsung.com/is/content/samsung/assets/global/mkt/knox/resources/samsung-knox-vault-whitepaper.pdf
Knox Vault splits secure processor from primary SoC via isolated I2C/SPI bus. Runs distinct Knox Vault OS covering 64KB SRAM and 512KB NVRAM with active metal shield mesh against physical decap attacks. Logical and bus isolation described; board-level power rail independence is OEM implementation-dependent.