Yale Assure Lock SL (YRD256)

Yale Assure Lock SL (YRD256)
Security Grade A- Calculator v	Yale Assure Lock SL (YRD256) Brand: Yale (Parent: ASSA ABLOY) Category: Smart Lock • Model / Gen: Assure Lock SL YRD256 Release Date: 2018-01-01 • Status: In sale Classification Date: • Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	Rare	—	Designed with physical tamper alarms and anti-pick cylinders.
Known vulnerabilities	Rare	🔗 Proof	Very few direct critical network CVEs; security heavily relies on the connected smart home hub.
Prior attacks	Rare	—	No widespread botnet attacks; attacks usually require physical proximity or hub compromise.
Updatability	Very common	🔗 Proof	Firmware updates are delivered via the connected Z-Wave hub or Yale Access App.
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Full	🔗 Proof	Requires strict pairing and authentication with Z-Wave hubs or mobile devices.
Communications	Encrypted with up-to-date encryption	—	Uses Z-Wave S2 security framework or encrypted Bluetooth (BLE).
Storage	No encryption	—	Only stores local lock states and PIN codes internally; not a bulk data storage device.
Category Score	Score: 2 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Full	—	User PINs and app access are managed through the Yale Access app and master account.
Authentication	Secure	—	Supports multi-factor entry (PIN, key, or app).
Brute-force protection	Exist	—	Built-in lockout mechanisms after multiple incorrect PIN attempts.
Event logging	Access event logged	—	App logs who unlocked the door and at what time.
Passwords	Require change after setup with complexity requirements	—	Master PIN must be set up during installation; app enforces standard PIN complexity.
Category Score	Score: 1 / 3

Technical Specifications

Property	Details
Operating System & App	Embedded Firmware (Companion App: Yale Access App)
Hardware (CPU / GPU)	CPU: N/A • GPU:
Memory & Storage	Memory: N/A • Storage: N/A
Power, Battery & Charging	Battery: 4 x AA Batteries • Power: Battery Powered • Charging:
Display & Camera	Display: • Camera:
Sound & Connectivity	Sound: • Connectivity: Z-Wave Plus / Bluetooth
Physical (Dimensions & Mass)	Dimensions: 1.1 x 2.75 x 7.0 inches • Mass: 4 lbs

The Yale Assure Lock SL is a smart lock prioritizing physical security and encrypted local communications (Z-Wave/Bluetooth). While it has a low attack surface for direct remote exploitation, its security depends heavily on the connected smart home hub. Physical tampering alarms and brute-force lockout mechanisms protect the device locally. Due to its robust encryption and strict authentication, it requires a moderate level of security management.