Flutter Liveness Detection Randomized Plugin

A Flutter plugin for liveness detection with randomized challenge response method with an interaction mechanism between the user and the system in the form of a movement challenge that indicates life is detected on the face. This plugin helps implement secure biometric authentication by detecting real human presence through dynamic facial verification challenges.

pub package

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Author

Crafted with love by Bagus Subagja ❤️

Feel free to fork and modify this package to suit your needs - that's much more enjoyable than stealing or claiming my code 😊

Preview 🪟

Slide 16_9 - 1

https://github.com/user-attachments/assets/f7266dc9-c4a2-4fba-8684-0ead2f678180

Update 1.1.0

  • ⏱️ Added automatic cooldown feature after 3 failed verification attempts
  • 🔒 10-minute waiting period with persistent countdown (survives app restarts)
  • 🎯 Countdown only decreases when app is active (pauses when app is backgrounded)
  • 🔄 API Refactor: All parameters consolidated into LivenessDetectionConfig
  • 🎯 Simplified API - only requires context and config parameters
  • 🛠️ Fixed customizedLabel logic for proper skip challenge behavior
  • ✅ Added validation: customizedLabel must not be null when useCustomizedLabel is true

Update 1.0.6

Slide 16_9 - 9 Face stretching already fixed on this version

Features ✨

  • 📱 Real-time face detection
  • 🎲 Randomized challenge sequence generation
  • 💫 Cross-platform support (iOS & Android)
  • 🎨 Light and dark mode support
  • ✅ High accuracy liveness verification
  • 🚀 Simple integration API
  • 🎭 Customizable liveness challenge labels
  • ⏳ Flexible security verification duration
  • 🎲 Adjustable number of liveness challenges
  • 🛠️ Adjustable image quality result
  • ⏱️ Automatic cooldown after failed attempts

Getting Started 🌟

Add this to your package's pubspec.yaml file:

dependencies:
  flutter_liveness_detection_randomized_plugin: ^1.1.0

Usage 🚀

final String? response = await FlutterLivenessDetectionRandomizedPlugin.instance.livenessDetection(
  context: context,
  config: LivenessDetectionConfig(
    // Camera & Image Settings
    cameraResolution: ResolutionPreset.medium, // Camera resolution
    imageQuality: 100, // Image quality (0-100)
    isEnableMaxBrightness: true, // Auto brightness adjustment
    
    // Detection Settings
    durationLivenessVerify: 60, // Detection timeout in seconds
    showDurationUiText: false, // Show countdown timer
    startWithInfoScreen: true, // Show tutorial screen
    
    // UI Settings
    isDarkMode: false, // Dark/light theme
    showCurrentStep: true, // Show step counter
    isEnableSnackBar: true, // Show result notifications
    shuffleListWithSmileLast: true, // Randomize challenges with smile last
    
    // Customization
    useCustomizedLabel: false, // Enable custom labels
    customizedLabel: LivenessDetectionLabelModel(
      blink: '', // Empty string = skip challenge
      lookDown: '', // Skip this challenge
      lookLeft: null, // null = use default "Look LEFT"
      lookRight: 'Turn Right', // Custom label
      lookUp: 'Look Up Please', // Custom label
      smile: null, // null = use default "Smile"
    ),
    
    // Security Features
    enableCooldownOnFailure: true, // Enable cooldown after failures
    maxFailedAttempts: 3, // Failed attempts before cooldown
    cooldownMinutes: 10, // Cooldown duration
  ),
);

Configuration Parameters 📋

Camera & Image Settings

  • cameraResolution: Camera quality (ResolutionPreset.low/medium/high)
  • imageQuality: Output image quality 0-100 (default: 100)
  • isEnableMaxBrightness: Auto brightness adjustment (default: true)

Detection Settings

  • durationLivenessVerify: Detection timeout in seconds (default: 45)
  • showDurationUiText: Show countdown timer (default: false)
  • startWithInfoScreen: Show tutorial before detection (default: false)

UI Settings

  • isDarkMode: Dark theme mode (default: true)
  • showCurrentStep: Show current step number (default: false)
  • isEnableSnackBar: Show success/failure notifications (default: true)
  • shuffleListWithSmileLast: Randomize challenges with smile at end (default: true)

Customization

  • useCustomizedLabel: Enable custom challenge labels (default: false)
  • customizedLabel: Custom labels for each challenge type

Security Features

  • enableCooldownOnFailure: Enable cooldown after failed attempts (default: true)
  • maxFailedAttempts: Number of failures before cooldown (default: 3)
  • cooldownMinutes: Cooldown duration in minutes (default: 10)

Cooldown Feature

The plugin includes an automatic cooldown mechanism to prevent brute force attempts:

  • Configurable number of failed attempts before cooldown
  • Configurable cooldown duration
  • Countdown timer only decreases when app is active
  • Cooldown state persists through app restarts
  • Users see a countdown screen during cooldown period

Customized Steps Label

You can customize challenge labels or skip certain challenges:

  • Use empty string '' to skip a challenge
  • Use null to keep default label
  • Provide custom string for personalized labels
  • When useCustomizedLabel: true, customizedLabel must not be null

Complete Example 💡

import 'package:flutter_liveness_detection_randomized_plugin/index.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              final result = await FlutterLivenessDetectionRandomizedPlugin.instance.livenessDetection(
                context: context,
                config: LivenessDetectionConfig(
                  startWithInfoScreen: true,
                  isDarkMode: false,
                  showCurrentStep: true,
                  isEnableSnackBar: true,
                ),
              );
              
              if (result != null) {
                // Liveness detection successful
                print('Face captured: $result');
              } else {
                // Detection failed or cancelled
                print('Detection failed');
              }
            },
            child: Text('Start Liveness Detection'),
          ),
        ),
      ),
    );
  }
}

Platform Setup

Android

Add camera permission to your android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.CAMERA"/>

Minimum SDK version: 23

iOS

Add camera usage description to ios/Runner/Info.plist:

<key>NSCameraUsageDescription</key>
<string>Camera access is required for liveness detection</string>

Testing Scenarios 🧪

The example app includes 8 comprehensive liveness scenarios to test all features:

Scenario 1: Default Configuration

LivenessDetectionConfig(
  shuffleListWithSmileLast: true,
  startWithInfoScreen: true,
  // Standard settings
)

Scenario 2: Random Shuffle

LivenessDetectionConfig(
  shuffleListWithSmileLast: false,
  durationLivenessVerify: 30,
  startWithInfoScreen: false,
)

Scenario 3: Dark Mode + High Resolution

LivenessDetectionConfig(
  isDarkMode: true,
  cameraResolution: ResolutionPreset.high,
  durationLivenessVerify: 60,
)

Scenario 4: Custom Indonesian Labels

LivenessDetectionConfig(
  useCustomizedLabel: true,
  customizedLabel: LivenessDetectionLabelModel(
    blink: 'Kedip 2-3 Kali',
    lookUp: 'Lihat ke Atas',
    smile: 'Tersenyum Lebar',
  ),
)

Scenario 5: Skip Steps (Minimal Challenges)

LivenessDetectionConfig(
  useCustomizedLabel: true,
  customizedLabel: LivenessDetectionLabelModel(
    blink: 'Blink Eyes',
    lookDown: '', // Skip
    lookLeft: '', // Skip  
    lookRight: '', // Skip
    lookUp: 'Look Up Please',
    smile: 'Smile Wide',
  ),
)

Scenario 6: Timer + Cooldown Features

LivenessDetectionConfig(
  showDurationUiText: true,
  enableCooldownOnFailure: true,
  maxFailedAttempts: 2,
  cooldownMinutes: 5,
)

Scenario 7: Minimal Features

LivenessDetectionConfig(
  isEnableMaxBrightness: false,
  isEnableSnackBar: false,
  showCurrentStep: false,
)

Scenario 8: All Features Enabled

LivenessDetectionConfig(
  isDarkMode: true,
  cameraResolution: ResolutionPreset.high,
  showDurationUiText: true,
  enableCooldownOnFailure: true,
  useCustomizedLabel: true,
  customizedLabel: LivenessDetectionLabelModel(
    blink: '👁️ Kedipkan Mata',
    smile: '😊 Senyum Manis',
  ),
)

Migration Guide 🔄

From v1.0.x to v1.1.0+

All parameters are now consolidated into the LivenessDetectionConfig object:

Before:

await plugin.livenessDetection(
  context: context,
  config: LivenessDetectionConfig(...),
  isEnableSnackBar: true,
  shuffleListWithSmileLast: true,
  showCurrentStep: true,
  isDarkMode: false,
);

After:

await plugin.livenessDetection(
  context: context,
  config: LivenessDetectionConfig(
    isEnableSnackBar: true,
    shuffleListWithSmileLast: true,
    showCurrentStep: true,
    isDarkMode: false,
    // ... other parameters
  ),
);

Libraries

flutter_liveness_detection_randomized_plugin
flutter_liveness_detection_randomized_plugin_method_channel
flutter_liveness_detection_randomized_plugin_platform_interface
index