Yubico YubiKey 5 Series

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Revision as of 05:56, 28 September 2025 by Potato417 (talk | contribs) (This device is purpose-built for security, making its classification unique. Its greatest strength—non-updatable, tamper-resistant hardware—is also a potential weakness if a critical flaw is ever discovered in the firmware. It has no traditional "user account" system but is instead a credential used by other systems. Its security model is based entirely on physical possession and cryptographic authentication.)

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Yubico YubiKey 5 Series
Security Grade
   
     B
Calculator v
YubiKey 5 Series (e.g., YubiKey 5C NFC)
   Brand: Yubico (Parent: Yubico AB)

   Category: Hardware Authentication Token / Security Key • Model / Gen: 5th Generation YubiKey 5C, 5C NFC, 5Ci, 5 NFC, etc.

   Release Date: 2018-09-01 • Status: In sale

   Classification Date:  • Official Website

Security Evaluation

1. Device Security

Criterion Value Proof Comment
Known hardware tampering None —
Known vulnerabilities None —
Prior attacks None —
Updatability None —
Category Score Score: 2 / 3

2. System Security

Criterion Value Proof Comment
Authentication with other systems Full —
Communications Encrypted with up-to-date encryption —
Storage Encrypted with up-to-date encryption —
Category Score Score: 1 / 3

3. User Authentication

Criterion Value Proof Comment
Account management Absent —
Authentication Secure —
Brute-force protection Exist —
Event logging Absent —
Passwords Default/Common/Easy to guess —
Category Score Score: 3 / 3

Technical Specifications

Property Details
Operating System & App Proprietary Firmware (Companion App: Yubico Manager (for configuration))
Hardware (CPU / GPU) CPU: Secure Element (Yubico Proprietary) • GPU: N/A
Memory & Storage Memory: Limited onboard memory for configurations and secrets • Storage: Secure NVM (Non-Volatile Memory) for cryptographic keys
Power, Battery & Charging Battery: N/A (Passive device, powered by host) • Power: USB-C / NFC / Lightning (depending on model) • Charging: N/A
Display & Camera Display: N/A • Camera: N/A
Sound & Connectivity Sound: N/A • Connectivity: USB-C, USB-A, Lightning, NFC (varies by model)
Physical (Dimensions & Mass) Dimensions: Varies by model (e.g., 5C: 47mm x 15mm x 4.4mm) • Mass: Approx. 4.5g


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