Xiaomi brand 7

Classification

Device
Criterion	Value	Proof(s)	Comment
Known hardware tampering	None	[2]	Sealed design with waterproof adhesive, non-removable battery, and secure component fixation (e.g., ZIF connectors, metal shielding) make hardware tampering difficult. No documented vulnerabilities in this area.
Known vulnerabilities	None	[3]	While older Xiaomi trackers (e.g., Mi Band 5) had Bluetooth protocol flaws, the Mi Band 7 uses Bluetooth 5.2 BLE with enhanced encryption (AES-256 + ECDH key exchange) to mitigate replay and man-in-the-middle attacks . No major vulnerabilities specific to the Mi Band 7 have been publicly disclosed.
Prior attacks	None	[4]	No widespread attacks targeting the Mi Band 7 have been reported. The device’s protocol improvements likely reduce exposure to exploits affecting earlier models.
Updatability	Very common	[5]	Sealed design with waterproof adhesive, non-removable battery, and secure component fixation (e.g., ZIF connectors, metal shielding) make hardware tampering difficult. No documented vulnerabilities in this area.
Category score	1

System
Criterion	Value	Proof(s)	Comment
Authentication with other systems	Partial	[6]	Integrates with Mi Account for 2FA and supports QR code-based login for third-party apps (e.g., social media, payment platforms). However, cross-system authentication is limited to Xiaomi’s ecosystem.
Communications	Encrypted with obselete encryption	[7]	Uses Bluetooth 5.2 BLE with AES-256 encryption for data transfer. Cloud synchronization employs TLS 1.3 to protect data in transit.
Storage	Encrypted with obselete encryption	[8]	Mi Band 7 Security Local health data (e.g., heart rate, sleep) is encrypted using AES-256 in the device’s secure storage. Cloud data follows Xiaomi’s tiered encryption framework, including AES-256 and hardware-backed keys.
Category score	2

User Authentication
Criterion	Value	Proof(s)	Comment
Account management	Basic	[9]	Supports core functions (login, device binding) but lacks granular permission controls (e.g., role-based access).
Authentication	Secure	[10]	Combines QR code scanning (with ECDH key exchange) and Mi Account 2FA. Heart rate verification adds an optional biometric layer.
Brute-force protection	Exist	[11]	Locks the device after 5 consecutive failed login attempts, requiring a password reset via Mi Account.
Event logging	Partial logging	[12]	Logs critical events (login attempts, firmware updates) but not all system activities. Data backup is encrypted and tied to Mi Account.
Passwords	Require change after setup with complexity requirements	[13]	Mi Band 7 Initial Pairing Mandates alphanumeric passwords with 4–16 characters during initial pairing. Users are prompted to reset passwords if security risks are detected.
Category score	2

Grade	A-