Yubico YubiKey 5 Series

Classification

Yubico YubiKey 5 Series
Classification
Grade	B
Calculator version	1
Classification date	2025-10-09
Information
Name	YubiKey 5 Series (e.g., YubiKey 5C NFC)
Brand by Parent	Yubico by Yubico AB
Generation	5th Generation
Model(s)	YubiKey 5C, 5C NFC, 5Ci, 5 NFC, etc.
Release date	2018-09-01
Type/Category	Hardware Authentication Token / Security Key
Website	[1]
Status	In sale
More
Dimensions	Varies by model (e.g., 5C: 47mm x 15mm x 4.4mm)
Mass	Approx. 4.5g
Operating system	Proprietary Firmware
Companion App	Yubico Manager (for configuration)
CPU	Secure Element (Yubico Proprietary)
GPU	N/A
Memory	Limited onboard memory for configurations and secrets
Storage	Secure NVM (Non-Volatile Memory) for cryptographic keys
Battery	N/A (Passive device, powered by host)
Power	USB-C / NFC / Lightning (depending on model)
Charging	N/A
Display	N/A
Camera	N/A
Sound	N/A
Connectivity	USB-C, USB-A, Lightning, NFC (varies by model)

Device
Criterion	Value	Proof(s)	Comment
Known hardware tampering	None	[]
Known vulnerabilities	None	[]
Prior attacks	None	[]
Updatability	None	[]
Category score	2

System
Criterion	Value	Proof(s)	Comment
Authentication with other systems	Full	[]
Communications	Encrypted with up-to-date encryption	[]
Storage	Encrypted with up-to-date encryption	[]
Category score	1

User Authentication
Criterion	Value	Proof(s)	Comment
Account management	Absent	[]
Authentication	Secure	[]
Brute-force protection	Exist	[]
Event logging	Absent	[]
Passwords	Default/Common/Easy to guess	[]
Category score	3

Grade	B