Vivo Z5x

Vivo Z5x
Security Grade B Calculator v	Vivo Z5x 5G Smart Phone Brand: Vivo (Parent: vivo Communication Technology Co., Ltd.) Category: 5G Smart Phone • Model / Gen: Z5x Series (Part of Vivo Z Series) V1911A, V1911T (Main models for Chinese market; regional variants exist) Release Date: 2019-05-01 • Status: End of sale Classification Date: • Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	Rare	🔗 Proof	The device features a highly integrated hardware design; disassembly requires professional tools and voids the warranty. Ordinary users have high tampering difficulty, and public hardware tampering cases are extremely rare.
Known vulnerabilities	Rare	🔗 Proof	During its support period, Vivo released updates to fix hardware-related vulnerabilities. Due to the model’s age, new vulnerabilities are rarely reported, and public high-risk hardware vulnerability records are scarce.
Prior attacks	None	[No public authoritative links 🔗 Proof]	There are no reports of large-scale hardware-targeted attacks on the Vivo Z5x. Most security incidents involving the model are software-level (e.g., app vulnerabilities) and unrelated to hardware.
Updatability	Very common	🔗 Proof	As a 2019-released model, Vivo has stopped providing major system version updates and regular security patches. Only critical emergency fixes (if any) may be issued, resulting in low updatability.
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Partial	🔗 Proof	Supports linkage authentication and data synchronization with other vivo devices via Vivo Account. Lacks full cross-platform authentication capabilities outside the vivo ecosystem.
Communications	Encrypted with up-to-date encryption	🔗 Proof	Wi-Fi supports WPA3 encryption; Bluetooth 5.0 adopts AES-CCM encryption; 5G communication complies with 3GPP-standard AES encryption, all meeting current security standards.
Storage	Encrypted with up-to-date encryption	🔗 Proof	Funtouch OS 9.1 (based on Android 9) enables File-based Encryption (FBE) by default, using the AES-256 algorithm, which is consistent with up-to-date storage encryption standards.
Category Score	Score: 2 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Full	🔗 Proof	Supports comprehensive management of local accounts and Vivo accounts, including creation, deletion, permission assignment (administrator/standard user), and account password recovery.
Authentication	Secure	🔗 Proof	Supports multiple secure authentication methods: password, PIN, side-mounted fingerprint recognition (capacitive), and 2D face recognition.
Brute-force protection	Exist	🔗 Proof	The system automatically locks the device for a period (e.g., 30 seconds) after 5 consecutive incorrect authentication attempts, effectively resisting brute-force attacks.
Event logging	Access event logged	🔗 Proof	Key access events (e.g., successful login, authentication failure, device lock) are recorded in the system log, which can be viewed via developer mode or professional tools.
Passwords	Require change after setup	🔗 Proof	Initial password/PIN setup is mandatory during first boot, but there is no built-in mandatory regular password change requirement. Users can manually set password complexity rules.
Category Score	Score: 2 / 3

Technical Specifications

Property	Details
Operating System & App	Pre-installed Funtouch OS 9.1 (Based on Android 9 Pie) (Companion App: Vivo Service, Vivo Official Website, Funtouch OS Security Center)
Hardware (CPU / GPU)	CPU: Qualcomm Snapdragon 712 (2×Cortex-A75 2.3GHz + 6×Cortex-A55 1.7GHz, Samsung 10nm LPP process) • GPU: Qualcomm Adreno 616
Memory & Storage	Memory: 4GB / 6GB / 8GB LPDDR4X (Dual-channel, non-expandable) • Storage: 128GB UFS 2.1 (Non-expandable; supports microSD card expansion up to 256GB)
Power, Battery & Charging	Battery: 5000mAh (Typical capacity) lithium polymer battery • Power: 18W fast charger (Input: 100-240V ~ 50/60Hz; Output: 9V/2A) • Charging: Supports 18W wired fast charging (vivo FlashCharge); no wireless charging
Display & Camera	Display: 6.53-inch LCD full-view screen, 2340×1080 (FHD+) resolution, 60Hz refresh rate, 400 nits typical brightness, 16.7 million colors, DC dimming support • Camera: - Rear: 16MP main camera (Samsung S5K3P9, f/1.79 aperture, PDAF) + 8MP ultra-wide-angle camera (f/2.2 aperture, 120° field of view) + 2MP depth camera (f/2.4 aperture) - Front: 16MP selfie camera (Samsung S5K3P9, f/2.0 aperture)
Sound & Connectivity	Sound: Single bottom-firing speaker, Hi-Res Audio certification, built-in microphone • Connectivity: - Network: 5G NR, Wi-Fi 5 (802.11ac), Bluetooth 5.0 - Others: NFC (partial models), Infrared remote control - Ports: USB Type-C (2.0), 3.5mm headphone jack
Physical (Dimensions & Mass)	Dimensions: Approximately 162.39 mm (L) × 77.33 mm (W) × 8.85 mm (H) • Mass: Approximately 193 g