Oura Ring Generation 3

Oura Ring Generation 3
Security Grade A Calculator v1	Oura Ring Gen3 Brand: Oura (Parent: Oura Health Oy) Category: Smart Ring • Model / Gen: 3 Heritage, Horizon Release Date: 2021-10-26 • Status: In sale Classification Date: 2025-10-13 • Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	None	🔗 Proof	Sealed unibody design, not user-serviceable. Attempting to open it would cause destructive damage.
Known vulnerabilities	Rare	🔗 Proof	No widespread, publicly documented vulnerabilities. The device receives regular over-the-air (OTA) firmware updates via the companion app.
Prior attacks	None	🔗 Proof	No publicly known, targeted attacks against the device or its firmware.
Updatability	Very common	🔗 Proof	Firmware is updated automatically and frequently over-the-air (OTA) through the connected Oura App.
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Full	🔗 Proof	Uses standard secure Bluetooth Low Energy (BLE) pairing protocols to authenticate with the smartphone app.
Communications	Encrypted with up-to-date encryption	🔗 Proof	All data transmitted between the ring and the phone is encrypted over the Bluetooth connection.
Storage	Encrypted with up-to-date encryption	🔗 Proof	Data is protected by the phone's OS-level encryption. Cloud data is encrypted at rest.
Category Score	Score: 1 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Full	🔗 Proof	Full user account management is provided through the Oura App and cloud service.
Authentication	Secure	🔗 Proof	Authentication is handled by the Oura cloud account, which supports strong passwords and SSO with Google/Apple (which can be MFA-protected).
Brute-force protection	Exist	🔗 Proof	Standard cloud service login mechanisms include protection against brute-force attacks.
Event logging	Access event logged	🔗 Proof	Account login activities are logged on the server-side for security and auditing purposes.
Passwords	Require change after setup with complexity requirements	🔗 Proof	Oura account creation enforces standard password complexity rules.
Category Score	Score: 1 / 3

Technical Specifications

Property	Details
Operating System & App	Proprietary firmware (Companion App: Oura App (iOS and Android))
Hardware (CPU / GPU)	CPU: Not publicly disclosed • GPU: N/A
Memory & Storage	Memory: Not publicly disclosed • Storage: Local buffer for up to 6 weeks of data
Power, Battery & Charging	Battery: Up to 7 days of battery life (15-22mAh LiPo) • Power: Custom charging puck with USB-C cable • Charging: Proprietary wireless charging
Display & Camera	Display: N/A (No display) • Camera: N/A
Sound & Connectivity	Sound: N/A • Connectivity: Bluetooth Low Energy (BLE)
Physical (Dimensions & Mass)	Dimensions: Width: 7.9mm, Thickness: 2.55mm (size varies) • Mass: 4g - 6g (depending on size)