Aqara Smart Lock U400 (DL-D06E)

Aqara Smart Lock U400 (DL-D06E)
Security Grade A Calculator v	Aqara Smart Lock U400 (DL-D06E) Brand: Aqara (Parent: Lumi United Technology Co., Ltd.) Category: Lock • Model / Gen: U400 DL-D06E Release Date: 2026-01-06 • Status: In sale Classification Date: • Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	None	🔗 Proof	No U400-specific public hardware tampering report found in reviewed sources; forced-entry alerts and BHMA Grade 3 are documented. This does not prove absence of tampering.
Known vulnerabilities	None	🔗 Proof	No U400-specific published security vulnerability identified in reviewed sources as of 24 Oct 2026; this is not proof that none exists.
Prior attacks	None	🔗 Proof	No documented U400-specific security attack identified in reviewed sources; manufacturer claims UWB relay/replay resistance. This does not prove attacks are impossible.
Updatability	Very common	🔗 Proof	Firmware updates are available by Bluetooth OTA in Aqara Home or Matter OTA in Apple Home.
Category Score	Score: 1 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Full	🔗 Proof	Matter over Thread pairing and Apple Home/Aqara Home user credentials support access through multiple ecosystems; exact integration permissions depend on the connected controller.
Communications	Encrypted with up-to-date encryption	🔗 Proof	Aqara states UWB uses encrypted IEEE 802.15.4z signals; Matter over Thread also uses encrypted communication. Cipher details for every radio path were not independently verified.
Storage	Encrypted with up-to-date encryption	🔗 Proof	Aqara says biometric and UWB data are kept locally with advanced encryption; the exact storage cipher and key handling are not published here.
Category Score	Score: 1 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Full	🔗 Proof	Aqara Home supports admin, ordinary and temporary permissions, up to 100 Aqara users, one-time and scheduled passcodes.
Authentication	Secure	🔗 Proof	Supports Apple home key with UWB secure ranging, fingerprint, NFC and user-defined PIN; multiple independent entry methods.
Brute-force protection	Exist	🔗 Proof	The U400 FAQ says repeated failed unlock attempts lock the keypad for 30 minutes; app and mechanical key still work.
Event logging	Partial logging	🔗 Proof	Aqara Home can alert on unlocked/door-not-closed events. A complete persistent access log is not established by this source.
Passwords	Require change after setup with complexity requirements	🔗 Proof	Users create PINs (6–10 digits in Aqara Home; 4–8 via Matter). No factory default PIN or post-setup forced change is documented; this rubric option approximates the user-created PIN policy.
Category Score	Score: 2 / 3

Technical Specifications

Property	Details
Operating System & App	(Companion App: Aqara Home)
Hardware (CPU / GPU)	CPU: • GPU:
Memory & Storage	Memory: • Storage:
Power, Battery & Charging	Battery: Rechargeable Li-ion battery, 7.3 V; up to 6 months • Power: • Charging: USB-C (battery or inner panel); external emergency USB-C power
Display & Camera	Display: • Camera:
Sound & Connectivity	Sound: • Connectivity: Bluetooth 5.2, Thread (Matter 1.4), UWB, NFC
Physical (Dimensions & Mass)	Dimensions: Inner: 178 × 76 × 46.9 mm; outer: 167 × 76 × 25.5 mm • Mass: