Flutter App Security Best Practices

Security should never be an afterthought in mobile app development. With increasing cyber threats and strict privacy regulations like GDPR and CCPA, protecting user data is both a legal requirement and a trust imperative.

This comprehensive guide covers essential security practices for Flutter apps, from basic data protection to advanced threat mitigation. Whether you're building a simple utility app or a complex fintech solution, these practices will help you build secure, trustworthy applications.

DATA ENCRYPTION & SECURE STORAGE

Protect sensitive data both at rest and in transit. Never store sensitive information in plain text, and always encrypt data before transmission.

// Secure Storage Implementation
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'package:crypto/crypto.dart';
import 'dart:convert';

class SecureStorageService {
  static const _storage = FlutterSecureStorage(
    aOptions: AndroidOptions(
      encryptedSharedPreferences: true,
      sharedPreferencesName: 'secure_prefs',
      preferencesKeyPrefix: 'app_',
    ),
    iOptions: IOSOptions(
      groupId: 'com.yourapp.security',
      accessibility: IOSAccessibility.first_unlock_this_device,
      synchronizable: false,
    ),
  );
  
  // Store encrypted sensitive data
  static Future<void> storeSecureData(String key, String value) async {
    try {
      final encryptedValue = _encryptData(value);
      await _storage.write(key: key, value: encryptedValue);
    } catch (e) {
      throw SecurityException('Failed to store secure data: $e');
    }
  }
  
  // Retrieve and decrypt sensitive data
  static Future<String?> getSecureData(String key) async {
    try {
      final encryptedValue = await _storage.read(key: key);
      if (encryptedValue == null) return null;
      return _decryptData(encryptedValue);
    } catch (e) {
      throw SecurityException('Failed to retrieve secure data: $e');
    }
  }
  
  // Store authentication tokens securely
  static Future<void> storeAuthToken(String token) async {
    await storeSecureData('auth_token', token);
    await storeSecureData('token_timestamp', DateTime.now().toIso8601String());
  }
  
  // Check if token is valid and not expired
  static Future<bool> isTokenValid() async {
    final token = await getSecureData('auth_token');
    final timestampStr = await getSecureData('token_timestamp');
    
    if (token == null || timestampStr == null) return false;
    
    final timestamp = DateTime.parse(timestampStr);
    final now = DateTime.now();
    const tokenLifetime = Duration(hours: 24);
    
    return now.difference(timestamp) < tokenLifetime;
  }
  
  // Clear all sensitive data
  static Future<void> clearAllSecureData() async {
    await _storage.deleteAll();
  }
  
  // Basic encryption for additional security layer
  static String _encryptData(String data) {
    final bytes = utf8.encode(data);
    final digest = sha256.convert(bytes);
    return base64.encode(bytes); // In production, use proper encryption
  }
  
  static String _decryptData(String encryptedData) {
    final bytes = base64.decode(encryptedData);
    return utf8.decode(bytes);
  }
}

// Advanced Encryption Service
import 'package:pointycastle/export.dart';

class AdvancedEncryptionService {
  static final _key = _generateKey();
  static final _iv = _generateIV();
  
  static Uint8List encrypt(String plainText) {
    final plainBytes = Uint8List.fromList(utf8.encode(plainText));
    final cipher = AESFastEngine();
    final cbcCipher = CBCBlockCipher(cipher);
    final paddedCipher = PaddedBlockCipher('AES/CBC/PKCS7');
    
    paddedCipher.init(true, PaddedBlockCipherParameters(
      ParametersWithIV(KeyParameter(_key), _iv),
      null,
    ));
    
    return paddedCipher.process(plainBytes);
  }
  
  static String decrypt(Uint8List cipherBytes) {
    final cipher = AESFastEngine();
    final cbcCipher = CBCBlockCipher(cipher);
    final paddedCipher = PaddedBlockCipher('AES/CBC/PKCS7');
    
    paddedCipher.init(false, PaddedBlockCipherParameters(
      ParametersWithIV(KeyParameter(_key), _iv),
      null,
    ));
    
    final decrypted = paddedCipher.process(cipherBytes);
    return utf8.decode(decrypted);
  }
  
  static Uint8List _generateKey() {
    // In production, derive from secure random or user password
    final keyBytes = Uint8List(32);
    final secureRandom = SecureRandom('Fortuna');
    secureRandom.seed(KeyParameter(Uint8List.fromList('your-secret-key'.codeUnits)));
    
    for (int i = 0; i < keyBytes.length; i++) {
      keyBytes[i] = secureRandom.nextUint8();
    }
    return keyBytes;
  }
  
  static Uint8List _generateIV() {
    final ivBytes = Uint8List(16);
    final secureRandom = SecureRandom('Fortuna');
    
    for (int i = 0; i < ivBytes.length; i++) {
      ivBytes[i] = secureRandom.nextUint8();
    }
    return ivBytes;
  }
}

✅ STORAGE DO'S

• Use Flutter Secure Storage for tokens
• Encrypt sensitive data before storage
• Implement key rotation policies
• Set data expiration timestamps

❌ STORAGE DON'TS

• Never store passwords in plain text
• Don't use SharedPreferences for secrets
• Avoid hardcoded encryption keys
• Don't store PII without encryption

API SECURITY & AUTHENTICATION

Secure API communication is crucial for protecting data in transit. Implement proper authentication, authorization, and request signing to prevent unauthorized access.

// Secure API Client Implementation
import 'package:dio/dio.dart';
import 'package:dio_certificate_pinning/dio_certificate_pinning.dart';
import 'package:crypto/crypto.dart';

class SecureApiClient {
  late final Dio _dio;
  final String _baseUrl;
  final String _apiKey;
  
  SecureApiClient({
    required String baseUrl,
    required String apiKey,
  }) : _baseUrl = baseUrl, _apiKey = apiKey {
    _setupDio();
  }
  
  void _setupDio() {
    _dio = Dio();
    
    // Certificate pinning for enhanced security
    _dio.interceptors.add(
      CertificatePinningInterceptor(
        allowedSHAFingerprints: [
          'YOUR_SERVER_CERTIFICATE_SHA256_FINGERPRINT',
        ],
      ),
    );
    
    // Request/Response interceptor for security
    _dio.interceptors.add(
      InterceptorsWrapper(
        onRequest: (options, handler) {
          // Add security headers
          options.headers['Content-Type'] = 'application/json';
          options.headers['User-Agent'] = 'YourApp/1.0.0';
          options.headers['X-Requested-With'] = 'XMLHttpRequest';
          
          // Add timestamp and nonce for replay attack prevention
          final timestamp = DateTime.now().millisecondsSinceEpoch.toString();
          final nonce = _generateNonce();
          
          options.headers['X-Timestamp'] = timestamp;
          options.headers['X-Nonce'] = nonce;
          
          // Add request signature
          final signature = _signRequest(
            method: options.method,
            path: options.path,
            timestamp: timestamp,
            nonce: nonce,
            body: options.data?.toString() ?? '',
          );
          options.headers['X-Signature'] = signature;
          
          handler.next(options);
        },
        onResponse: (response, handler) {
          // Verify response signature if provided
          final responseSignature = response.headers['x-response-signature']?.first;
          if (responseSignature != null) {
            if (!_verifyResponseSignature(response.data, responseSignature)) {
              throw DioError(
                requestOptions: response.requestOptions,
                error: 'Invalid response signature',
                type: DioErrorType.other,
              );
            }
          }
          handler.next(response);
        },
        onError: (error, handler) {
          _handleApiError(error);
          handler.next(error);
        },
      ),
    );
  }
  
  // Authenticated GET request
  Future<Map<String, dynamic>> get(String endpoint) async {
    try {
      final token = await SecureStorageService.getSecureData('auth_token');
      if (token == null) throw UnauthorizedException('No auth token found');
      
      final response = await _dio.get(
        '$_baseUrl$endpoint',
        options: Options(
          headers: {'Authorization': 'Bearer $token'},
        ),
      );
      
      return response.data;
    } catch (e) {
      throw _handleApiException(e);
    }
  }
  
  // Authenticated POST request with body encryption
  Future<Map<String, dynamic>> post(String endpoint, Map<String, dynamic> data) async {
    try {
      final token = await SecureStorageService.getSecureData('auth_token');
      if (token == null) throw UnauthorizedException('No auth token found');
      
      // Encrypt sensitive data in request body
      final encryptedData = _encryptRequestBody(data);
      
      final response = await _dio.post(
        '$_baseUrl$endpoint',
        data: encryptedData,
        options: Options(
          headers: {
            'Authorization': 'Bearer $token',
            'Content-Encoding': 'encrypted',
          },
        ),
      );
      
      return response.data;
    } catch (e) {
      throw _handleApiException(e);
    }
  }
  
  // OAuth 2.0 / JWT Authentication
  Future<void> authenticate(String username, String password) async {
    try {
      // Never send passwords in plain text
      final hashedPassword = _hashPassword(password);
      
      final response = await _dio.post(
        '$_baseUrl/auth/login',
        data: {
          'username': username,
          'password': hashedPassword,
          'client_id': 'your_client_id',
          'grant_type': 'password',
        },
      );
      
      final accessToken = response.data['access_token'];
      final refreshToken = response.data['refresh_token'];
      
      await SecureStorageService.storeAuthToken(accessToken);
      await SecureStorageService.storeSecureData('refresh_token', refreshToken);
      
    } catch (e) {
      throw AuthenticationException('Authentication failed: $e');
    }
  }
  
  // Token refresh mechanism
  Future<void> refreshToken() async {
    final refreshToken = await SecureStorageService.getSecureData('refresh_token');
    if (refreshToken == null) throw UnauthorizedException('No refresh token');
    
    try {
      final response = await _dio.post(
        '$_baseUrl/auth/refresh',
        data: {
          'refresh_token': refreshToken,
          'grant_type': 'refresh_token',
        },
      );
      
      final newAccessToken = response.data['access_token'];
      await SecureStorageService.storeAuthToken(newAccessToken);
      
    } catch (e) {
      // Clear tokens if refresh fails
      await SecureStorageService.clearAllSecureData();
      throw AuthenticationException('Token refresh failed: $e');
    }
  }
  
  String _signRequest({
    required String method,
    required String path,
    required String timestamp,
    required String nonce,
    required String body,
  }) {
    final message = '$method$path$timestamp$nonce$body';
    final key = utf8.encode(_apiKey);
    final messageBytes = utf8.encode(message);
    
    final hmac = Hmac(sha256, key);
    final digest = hmac.convert(messageBytes);
    return digest.toString();
  }
  
  String _generateNonce() {
    final random = Random.secure();
    final values = List<int>.generate(16, (i) => random.nextInt(256));
    return base64.encode(values);
  }
  
  Map<String, dynamic> _encryptRequestBody(Map<String, dynamic> data) {
    // Encrypt sensitive fields
    final sensitiveFields = ['password', 'ssn', 'credit_card', 'personal_data'];
    final encryptedData = Map<String, dynamic>.from(data);
    
    for (final field in sensitiveFields) {
      if (encryptedData.containsKey(field)) {
        final plainText = encryptedData[field].toString();
        encryptedData[field] = base64.encode(
          AdvancedEncryptionService.encrypt(plainText),
        );
      }
    }
    
    return encryptedData;
  }
  
  String _hashPassword(String password) {
    // Use bcrypt or Argon2 in production
    final salt = 'your_app_salt'; // Use proper salt generation
    final combined = password + salt;
    final digest = sha256.convert(utf8.encode(combined));
    return digest.toString();
  }
}

🔐 API Security Checklist:

• Implement certificate pinning
• Use HMAC signatures for request verification
• Add timestamp and nonce for replay protection
• Encrypt sensitive data in request/response
• Implement proper token refresh mechanisms

BIOMETRIC AUTHENTICATION & DEVICE SECURITY

Implement biometric authentication and device security checks to ensure your app runs only on trusted devices and provides secure user authentication.

// Biometric Authentication Service
import 'package:local_auth/local_auth.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/services.dart';

class BiometricAuthService {
  static final LocalAuthentication _localAuth = LocalAuthentication();
  
  // Check if biometric authentication is available
  static Future<bool> isBiometricAvailable() async {
    try {
      final isAvailable = await _localAuth.canCheckBiometrics;
      final isDeviceSupported = await _localAuth.isDeviceSupported();
      return isAvailable && isDeviceSupported;
    } catch (e) {
      return false;
    }
  }
  
  // Get available biometric types
  static Future<List<BiometricType>> getAvailableBiometrics() async {
    try {
      return await _localAuth.getAvailableBiometrics();
    } catch (e) {
      return [];
    }
  }
  
  // Authenticate with biometrics
  static Future<bool> authenticateWithBiometrics({
    required String reason,
    bool stickyAuth = true,
  }) async {
    try {
      final isAvailable = await isBiometricAvailable();
      if (!isAvailable) return false;
      
      return await _localAuth.authenticate(
        localizedReason: reason,
        authMessages: const [
          AndroidAuthMessages(
            signInTitle: 'Biometric Authentication',
            biometricHint: 'Verify your identity',
            biometricNotRecognized: 'Biometric not recognized',
            biometricRequiredTitle: 'Biometric Required',
            biometricSuccess: 'Authentication successful',
            cancelButton: 'Cancel',
            deviceCredentialsRequiredTitle: 'Device credentials required',
            deviceCredentialsSetupDescription: 'Please set up device credentials',
            goToSettingsButton: 'Go to Settings',
            goToSettingsDescription: 'Please set up biometric authentication',
          ),
          IOSAuthMessages(
            lockOut: 'Biometric authentication is disabled',
            goToSettingsButton: 'Go to Settings',
            goToSettingsDescription: 'Please set up biometric authentication',
            cancelButton: 'Cancel',
          ),
        ],
        options: AuthenticationOptions(
          stickyAuth: stickyAuth,
          biometricOnly: false, // Allow fallback to device credentials
        ),
      );
    } catch (e) {
      return false;
    }
  }
  
  // Enhanced authentication with retry logic
  static Future<AuthResult> authenticateWithRetry({
    required String reason,
    int maxRetries = 3,
  }) async {
    int attempts = 0;
    
    while (attempts < maxRetries) {
      try {
        final success = await authenticateWithBiometrics(reason: reason);
        if (success) {
          return AuthResult.success();
        }
        attempts++;
      } catch (e) {
        if (e is PlatformException) {
          switch (e.code) {
            case 'UserCancel':
              return AuthResult.cancelled();
            case 'BiometricOnlyNotSupported':
              return AuthResult.fallbackRequired();
            case 'DeviceNotSupported':
              return AuthResult.notSupported();
            default:
              attempts++;
          }
        }
      }
    }
    
    return AuthResult.failed('Maximum authentication attempts exceeded');
  }
}

// Device Security Checks
class DeviceSecurityService {
  static final DeviceInfoPlugin _deviceInfo = DeviceInfoPlugin();
  
  // Check if device is rooted/jailbroken
  static Future<bool> isDeviceCompromised() async {
    try {
      if (Platform.isAndroid) {
        return await _checkAndroidRootedDevice();
      } else if (Platform.isIOS) {
        return await _checkIOSJailbrokenDevice();
      }
      return false;
    } catch (e) {
      return true; // Assume compromised if check fails
    }
  }
  
  static Future<bool> _checkAndroidRootedDevice() async {
    final androidInfo = await _deviceInfo.androidInfo;
    
    // Check for common root indicators
    final rootIndicators = [
      '/system/app/Superuser.apk',
      '/sbin/su',
      '/system/bin/su',
      '/system/xbin/su',
      '/data/local/xbin/su',
      '/data/local/bin/su',
      '/system/sd/xbin/su',
      '/system/bin/failsafe/su',
      '/data/local/su',
    ];
    
    for (final path in rootIndicators) {
      if (await File(path).exists()) {
        return true;
      }
    }
    
    // Check for root apps
    try {
      await Process.run('which', ['su']);
      return true;
    } catch (e) {
      // su command not found, likely not rooted
    }
    
    return false;
  }
  
  static Future<bool> _checkIOSJailbrokenDevice() async {
    final iosInfo = await _deviceInfo.iosInfo;
    
    // Check for jailbreak indicators
    final jailbreakPaths = [
      '/Applications/Cydia.app',
      '/Library/MobileSubstrate/MobileSubstrate.dylib',
      '/bin/bash',
      '/usr/sbin/sshd',
      '/etc/apt',
      '/private/var/lib/apt/',
    ];
    
    for (final path in jailbreakPaths) {
      if (await File(path).exists()) {
        return true;
      }
    }
    
    return false;
  }
  
  // Check if app is running in debug mode
  static bool isDebugMode() {
    return kDebugMode;
  }
  
  // Verify app integrity
  static Future<bool> verifyAppIntegrity() async {
    try {
      // Check app signature (platform-specific implementation required)
      // This is a simplified check
      final packageInfo = await PackageInfo.fromPlatform();
      
      // Verify package name and version
      const expectedPackageName = 'com.yourapp.package';
      if (packageInfo.packageName != expectedPackageName) {
        return false;
      }
      
      return true;
    } catch (e) {
      return false;
    }
  }
  
  // Complete security check
  static Future<SecurityCheckResult> performSecurityCheck() async {
    final results = await Future.wait([
      isDeviceCompromised(),
      BiometricAuthService.isBiometricAvailable(),
      verifyAppIntegrity(),
    ]);
    
    final isCompromised = results[0] as bool;
    final biometricAvailable = results[1] as bool;
    final integrityValid = results[2] as bool;
    
    return SecurityCheckResult(
      isDeviceCompromised: isCompromised,
      isBiometricAvailable: biometricAvailable,
      isAppIntegrityValid: integrityValid,
      isDebugMode: isDebugMode(),
    );
  }
}

// Result classes
class AuthResult {
  final bool isSuccess;
  final String? error;
  final AuthResultType type;
  
  AuthResult._(this.isSuccess, this.error, this.type);
  
  factory AuthResult.success() => AuthResult._(true, null, AuthResultType.success);
  factory AuthResult.failed(String error) => AuthResult._(false, error, AuthResultType.failed);
  factory AuthResult.cancelled() => AuthResult._(false, 'User cancelled', AuthResultType.cancelled);
  factory AuthResult.notSupported() => AuthResult._(false, 'Not supported', AuthResultType.notSupported);
  factory AuthResult.fallbackRequired() => AuthResult._(false, 'Fallback required', AuthResultType.fallbackRequired);
}

enum AuthResultType { success, failed, cancelled, notSupported, fallbackRequired }

class SecurityCheckResult {
  final bool isDeviceCompromised;
  final bool isBiometricAvailable;
  final bool isAppIntegrityValid;
  final bool isDebugMode;
  
  SecurityCheckResult({
    required this.isDeviceCompromised,
    required this.isBiometricAvailable,
    required this.isAppIntegrityValid,
    required this.isDebugMode,
  });
  
  bool get isSecure => !isDeviceCompromised && isAppIntegrityValid && !isDebugMode;
}

🛡️ Device Security Features:

• Biometric authentication with fallback
• Root/jailbreak detection
• App integrity verification
• Debug mode detection

COMMON VULNERABILITIES & PREVENTION

Understanding common security vulnerabilities helps you proactively protect your app. Here are the most critical threats and how to prevent them.

⚠️ COMMON THREATS

• Man-in-the-middle attacks
• SQL injection through APIs
• Reverse engineering
• Data leakage through logs
• Insecure data transmission
• Code tampering

✅ PREVENTION MEASURES

• Certificate pinning
• Input validation & sanitization
• Code obfuscation
• Secure logging practices
• End-to-end encryption
• App integrity checks

// Security Utilities and Best Practices
class SecurityUtils {
  // Secure logging that prevents sensitive data leakage
  static void secureLog(String message, {LogLevel level = LogLevel.info}) {
    if (kReleaseMode) {
      // In production, only log non-sensitive information
      final sanitizedMessage = _sanitizeLogMessage(message);
      _logToSecureEndpoint(sanitizedMessage, level);
    } else {
      // In debug mode, allow detailed logging
      developer.log(message, level: level.value);
    }
  }
  
  static String _sanitizeLogMessage(String message) {
    // Remove sensitive patterns
    final sensitivePatterns = [
      RegExp(r'password[=:]s*S+', caseSensitive: false),
      RegExp(r'token[=:]s*S+', caseSensitive: false),
      RegExp(r'api[_-]?key[=:]s*S+', caseSensitive: false),
      RegExp(r'd{4}[s-]?d{4}[s-]?d{4}[s-]?d{4}'), // Credit card numbers
      RegExp(r'd{3}-d{2}-d{4}'), // SSN
    ];
    
    String sanitized = message;
    for (final pattern in sensitivePatterns) {
      sanitized = sanitized.replaceAll(pattern, '[REDACTED]');
    }
    return sanitized;
  }
  
  // Input validation and sanitization
  static String sanitizeInput(String input) {
    // Remove potentially dangerous characters
    return input
        .replaceAll(RegExp(r'[<>"']'), '')
        .replaceAll(RegExp(r'script', caseSensitive: false), '')
        .trim();
  }
  
  // Email validation with security considerations
  static bool isValidEmail(String email) {
    final emailRegex = RegExp(r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,}$');
    return emailRegex.hasMatch(email) && email.length <= 254;
  }
  
  // Password strength validation
  static PasswordStrength checkPasswordStrength(String password) {
    int score = 0;
    final feedback = <String>[];
    
    if (password.length >= 8) score += 1;
    else feedback.add('Use at least 8 characters');
    
    if (RegExp(r'[a-z]').hasMatch(password)) score += 1;
    else feedback.add('Include lowercase letters');
    
    if (RegExp(r'[A-Z]').hasMatch(password)) score += 1;
    else feedback.add('Include uppercase letters');
    
    if (RegExp(r'd').hasMatch(password)) score += 1;
    else feedback.add('Include numbers');
    
    if (RegExp(r'[!@#$&*~]').hasMatch(password)) score += 1;
    else feedback.add('Include special characters');
    
    // Check against common passwords
    if (_isCommonPassword(password)) {
      score = 0;
      feedback.add('Password is too common');
    }
    
    return PasswordStrength(score: score, feedback: feedback);
  }
  
  static bool _isCommonPassword(String password) {
    final commonPasswords = [
      'password', '123456', 'password123', 'admin', 'qwerty',
      'letmein', 'welcome', 'monkey', '1234567890', 'dragon'
    ];
    return commonPasswords.contains(password.toLowerCase());
  }
  
  // Generate secure random strings
  static String generateSecureToken(int length) {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    final random = Random.secure();
    return List.generate(length, (index) => chars[random.nextInt(chars.length)]).join();
  }
  
  // Rate limiting for API calls
  static final Map<String, List<DateTime>> _requestHistory = {};
  
  static bool isRateLimited(String identifier, {int maxRequests = 10, Duration window = const Duration(minutes: 1)}) {
    final now = DateTime.now();
    final windowStart = now.subtract(window);
    
    _requestHistory[identifier] ??= [];
    final requests = _requestHistory[identifier]!;
    
    // Remove old requests outside the window
    requests.removeWhere((time) => time.isBefore(windowStart));
    
    if (requests.length >= maxRequests) {
      return true; // Rate limited
    }
    
    requests.add(now);
    return false;
  }
}

// Security exceptions
class SecurityException implements Exception {
  final String message;
  SecurityException(this.message);
  
  @override
  String toString() => 'SecurityException: $message';
}

class AuthenticationException extends SecurityException {
  AuthenticationException(String message) : super(message);
}

class UnauthorizedException extends SecurityException {
  UnauthorizedException(String message) : super(message);
}

// Password strength result
class PasswordStrength {
  final int score;
  final List<String> feedback;
  
  PasswordStrength({required this.score, required this.feedback});
  
  PasswordStrengthLevel get level {
    if (score < 2) return PasswordStrengthLevel.weak;
    if (score < 4) return PasswordStrengthLevel.medium;
    return PasswordStrengthLevel.strong;
  }
}

enum PasswordStrengthLevel { weak, medium, strong }
enum LogLevel { debug, info, warning, error }

FLUTTER SECURITY CHECKLIST

📱 CLIENT-SIDE SECURITY

Use Flutter Secure Storage for tokens

Implement biometric authentication

Add root/jailbreak detection

Obfuscate release builds

Validate all user inputs

🌐 NETWORK SECURITY

Implement certificate pinning

Use HTTPS for all communications

Sign API requests with HMAC

Implement rate limiting

Encrypt sensitive request data

SECURE YOUR FLUTTER APP TODAY

Security should never be an afterthought. Our team can help you implement comprehensive security measures that protect your users and your business.

DATA ENCRYPTION & SECURE STORAGE

✅ STORAGE DO'S

❌ STORAGE DON'TS

API SECURITY & AUTHENTICATION

🔐 API Security Checklist:

BIOMETRIC AUTHENTICATION & DEVICE SECURITY

🛡️ Device Security Features:

COMMON VULNERABILITIES & PREVENTION

⚠️ COMMON THREATS

✅ PREVENTION MEASURES

FLUTTER SECURITY CHECKLIST

📱 CLIENT-SIDE SECURITY

🌐 NETWORK SECURITY

SECURE YOUR FLUTTER APP TODAY

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DATA ENCRYPTION & SECURE STORAGE

✅ STORAGE DO'S

❌ STORAGE DON'TS

API SECURITY & AUTHENTICATION

🔐 API Security Checklist:

BIOMETRIC AUTHENTICATION & DEVICE SECURITY

🛡️ Device Security Features:

COMMON VULNERABILITIES & PREVENTION

⚠️ COMMON THREATS

✅ PREVENTION MEASURES

FLUTTER SECURITY CHECKLIST

📱 CLIENT-SIDE SECURITY

🌐 NETWORK SECURITY

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