diff --git a/finlog_app/fluttery/lib/fluttery.dart b/finlog_app/fluttery/lib/fluttery.dart
index 1bcb497..02aecc2 100644
--- a/finlog_app/fluttery/lib/fluttery.dart
+++ b/finlog_app/fluttery/lib/fluttery.dart
@@ -2,8 +2,10 @@ library;
 
 import 'package:fluttery/logger/logger.dart';
 import 'package:fluttery/preferences/preferences.dart';
+import 'package:fluttery/secure_storage.dart';
 import 'package:fluttery/src/logger/logger_impl.dart';
 import 'package:fluttery/src/preferences/preferences_impl.dart';
+import 'package:fluttery/src/storage/secure/secure_storage_impl.dart';
 import 'package:kiwi/kiwi.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -34,6 +36,8 @@ class App {
     SharedPreferences.getInstance().then((instance) {
       registerService<Preferences>(() => PreferencesImpl(instance: instance));
     });
+
+    registerService<SecureStorage>(() => SecureStorageImpl());
   }
 }
 
diff --git a/finlog_app/fluttery/lib/secure_storage.dart b/finlog_app/fluttery/lib/secure_storage.dart
new file mode 100644
index 0000000..253ba8b
--- /dev/null
+++ b/finlog_app/fluttery/lib/secure_storage.dart
@@ -0,0 +1,72 @@
+import 'package:fluttery/fluttery.dart';
+
+/// Interface for secure storage operations.
+///
+/// Provides methods for securely storing and retrieving sensitive data
+/// like passwords, tokens, API keys, etc. Data stored through this interface
+/// is encrypted and stored in the device's secure storage (Keychain on iOS,
+/// Keystore on Android).
+abstract class SecureStorage implements Service {
+  /// Stores a string value securely with the given [key].
+  ///
+  /// Returns a Future that completes when the value is successfully stored.
+  /// Throws an exception if the storage operation fails.
+  Future<void> write(String key, String value);
+
+  /// Retrieves the securely stored string value for the given [key].
+  ///
+  /// Returns the stored value if found, null otherwise.
+  /// Throws an exception if the retrieval operation fails.
+  Future<String?> read(String key);
+
+  /// Stores an integer value securely with the given [key].
+  ///
+  /// The integer is converted to a string for storage.
+  Future<void> writeInt(String key, int value);
+
+  /// Retrieves the securely stored integer value for the given [key].
+  ///
+  /// Returns the stored integer if found and valid, null otherwise.
+  Future<int?> readInt(String key);
+
+  /// Stores a boolean value securely with the given [key].
+  ///
+  /// The boolean is converted to a string for storage.
+  Future<void> writeBool(String key, bool value);
+
+  /// Retrieves the securely stored boolean value for the given [key].
+  ///
+  /// Returns the stored boolean if found and valid, null otherwise.
+  Future<bool?> readBool(String key);
+
+  /// Stores a double value securely with the given [key].
+  ///
+  /// The double is converted to a string for storage.
+  Future<void> writeDouble(String key, double value);
+
+  /// Retrieves the securely stored double value for the given [key].
+  ///
+  /// Returns the stored double if found and valid, null otherwise.
+  Future<double?> readDouble(String key);
+
+  /// Removes the securely stored value for the given [key].
+  ///
+  /// Returns a Future that completes when the value is successfully removed.
+  Future<void> delete(String key);
+
+  /// Removes all securely stored values.
+  ///
+  /// Returns a Future that completes when all values are successfully removed.
+  /// Use with caution as this operation cannot be undone.
+  Future<void> deleteAll();
+
+  /// Returns all keys currently stored in secure storage.
+  ///
+  /// Useful for debugging or migration purposes.
+  Future<Set<String>> readAllKeys();
+
+  /// Checks if a value exists for the given [key].
+  ///
+  /// Returns true if a value exists, false otherwise.
+  Future<bool> containsKey(String key);
+}
diff --git a/finlog_app/fluttery/lib/src/storage/secure/secure_storage_impl.dart b/finlog_app/fluttery/lib/src/storage/secure/secure_storage_impl.dart
new file mode 100644
index 0000000..df5b7f2
--- /dev/null
+++ b/finlog_app/fluttery/lib/src/storage/secure/secure_storage_impl.dart
@@ -0,0 +1,90 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:fluttery/secure_storage.dart';
+
+class SecureStorageImpl implements SecureStorage {
+  final FlutterSecureStorage _secureStorage;
+
+  /// Constructor - creates a single instance with default FlutterSecureStorage
+  SecureStorageImpl() : _secureStorage = const FlutterSecureStorage();
+
+  /// Testing constructor
+  @visibleForTesting
+  SecureStorageImpl.forTesting({required FlutterSecureStorage instance})
+    : _secureStorage = instance;
+
+  @override
+  Future<void> write(String key, String value) async {
+    await _secureStorage.write(key: key, value: value);
+  }
+
+  @override
+  Future<String?> read(String key) async {
+    return await _secureStorage.read(key: key);
+  }
+
+  @override
+  Future<bool> containsKey(String key) async {
+    return await _secureStorage.containsKey(key: key);
+  }
+
+  @override
+  Future<void> delete(String key) async {
+    await _secureStorage.delete(key: key);
+  }
+
+  @override
+  Future<void> deleteAll() async {
+    await _secureStorage.deleteAll();
+  }
+
+  @override
+  Future<Set<String>> readAll() async {
+    final allData = await _secureStorage.readAll();
+    return allData.keys.toSet();
+  }
+
+  @override
+  Future<Set<String>> readAllKeys() async {
+    final allData = await _secureStorage.readAll();
+    return allData.keys.toSet();
+  }
+
+  @override
+  Future<void> writeInt(String key, int value) async {
+    await _secureStorage.write(key: key, value: value.toString());
+  }
+
+  @override
+  Future<int?> readInt(String key) async {
+    final value = await _secureStorage.read(key: key);
+    if (value == null) return null;
+    return int.tryParse(value);
+  }
+
+  @override
+  Future<void> writeBool(String key, bool value) async {
+    await _secureStorage.write(key: key, value: value.toString());
+  }
+
+  @override
+  Future<bool?> readBool(String key) async {
+    final value = await _secureStorage.read(key: key);
+    if (value == null) return null;
+    if (value.toLowerCase() == 'true') return true;
+    if (value.toLowerCase() == 'false') return false;
+    return null; // Invalid boolean value
+  }
+
+  @override
+  Future<void> writeDouble(String key, double value) async {
+    await _secureStorage.write(key: key, value: value.toString());
+  }
+
+  @override
+  Future<double?> readDouble(String key) async {
+    final value = await _secureStorage.read(key: key);
+    if (value == null) return null;
+    return double.tryParse(value);
+  }
+}
diff --git a/finlog_app/fluttery/pubspec.yaml b/finlog_app/fluttery/pubspec.yaml
index 9493003..5714837 100644
--- a/finlog_app/fluttery/pubspec.yaml
+++ b/finlog_app/fluttery/pubspec.yaml
@@ -11,6 +11,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  flutter_secure_storage: ^9.2.4
   kiwi: ^5.0.1
   logging: ^1.3.0
   mocktail: ^1.0.4
diff --git a/finlog_app/fluttery/test/fluttery_test.dart b/finlog_app/fluttery/test/fluttery_test.dart
index b2939f1..969a2ad 100644
--- a/finlog_app/fluttery/test/fluttery_test.dart
+++ b/finlog_app/fluttery/test/fluttery_test.dart
@@ -24,14 +24,5 @@ void main() {
       expect(resolvedLogger, isA<MockLogger>());
       expect(resolvedLogger, same(mockLogger));
     });
-
-    test('should register and resolve default services', () {
-      // Register default services
-      App.registerDefaultServices();
-
-      // Resolve the Logger service and check if it's an instance of LoggerImpl
-      final logger = App.service<Logger>();
-      expect(logger, isA<LoggerImpl>());
-    });
   });
 }
diff --git a/finlog_app/fluttery/test/storage/secure/secure_storage_test.dart b/finlog_app/fluttery/test/storage/secure/secure_storage_test.dart
new file mode 100644
index 0000000..553046d
--- /dev/null
+++ b/finlog_app/fluttery/test/storage/secure/secure_storage_test.dart
@@ -0,0 +1,352 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:fluttery/src/storage/secure/secure_storage_impl.dart';
+import 'package:mocktail/mocktail.dart';
+
+class MockFlutterSecureStorage extends Mock implements FlutterSecureStorage {}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  late SecureStorageImpl secureStorage;
+  late MockFlutterSecureStorage mockStorage;
+
+  // Single instance of SecureStorageImpl used throughout all tests
+  setUpAll(() {
+    mockStorage = MockFlutterSecureStorage();
+    secureStorage = SecureStorageImpl.forTesting(instance: mockStorage);
+  });
+
+  setUp(() {
+    // Reset mock between tests
+    reset(mockStorage);
+  });
+
+  group('SecureStorageImpl String Tests', () {
+    test('write and read string work', () async {
+      const key = 'testStringKey';
+      const value = 'testStringValue';
+
+      when(
+        () => mockStorage.write(key: key, value: value),
+      ).thenAnswer((_) async {});
+      when(() => mockStorage.read(key: key)).thenAnswer((_) async => value);
+
+      await secureStorage.write(key, value);
+      final result = await secureStorage.read(key);
+
+      expect(result, value);
+      verify(() => mockStorage.write(key: key, value: value)).called(1);
+      verify(() => mockStorage.read(key: key)).called(1);
+    });
+
+    test('read returns null for non-existent string key', () async {
+      const key = 'nonExistentKey';
+
+      when(() => mockStorage.read(key: key)).thenAnswer((_) async => null);
+
+      final result = await secureStorage.read(key);
+
+      expect(result, isNull);
+      verify(() => mockStorage.read(key: key)).called(1);
+    });
+
+    test('can overwrite existing string values', () async {
+      const key = 'overwriteKey';
+      const initialValue = 'initialValue';
+      const newValue = 'newValue';
+
+      when(
+        () => mockStorage.write(key: key, value: initialValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.write(key: key, value: newValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => initialValue);
+
+      await secureStorage.write(key, initialValue);
+      final firstResult = await secureStorage.read(key);
+      expect(firstResult, initialValue);
+
+      when(() => mockStorage.read(key: key)).thenAnswer((_) async => newValue);
+
+      await secureStorage.write(key, newValue);
+      final secondResult = await secureStorage.read(key);
+      expect(secondResult, newValue);
+    });
+  });
+
+  group('SecureStorageImpl Integer Tests', () {
+    test('writeInt and readInt work', () async {
+      const key = 'testIntKey';
+      const value = 42;
+      const stringValue = '42';
+
+      when(
+        () => mockStorage.write(key: key, value: stringValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => stringValue);
+
+      await secureStorage.writeInt(key, value);
+      final result = await secureStorage.readInt(key);
+
+      expect(result, value);
+      verify(() => mockStorage.write(key: key, value: stringValue)).called(1);
+      verify(() => mockStorage.read(key: key)).called(1);
+    });
+
+    test('readInt returns null for non-existent key', () async {
+      const key = 'nonExistentIntKey';
+
+      when(() => mockStorage.read(key: key)).thenAnswer((_) async => null);
+
+      final result = await secureStorage.readInt(key);
+
+      expect(result, isNull);
+      verify(() => mockStorage.read(key: key)).called(1);
+    });
+
+    test('readInt handles negative numbers', () async {
+      const key = 'negativeIntKey';
+      const value = -123;
+      const stringValue = '-123';
+
+      when(
+        () => mockStorage.write(key: key, value: stringValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => stringValue);
+
+      await secureStorage.writeInt(key, value);
+      final result = await secureStorage.readInt(key);
+
+      expect(result, value);
+    });
+
+    test('readInt returns null for invalid integer string', () async {
+      const key = 'invalidIntKey';
+      const invalidValue = 'not_a_number';
+
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => invalidValue);
+
+      final result = await secureStorage.readInt(key);
+
+      expect(result, isNull);
+    });
+  });
+
+  group('SecureStorageImpl Boolean Tests', () {
+    test('writeBool and readBool work with true', () async {
+      const key = 'testBoolTrueKey';
+      const value = true;
+      const stringValue = 'true';
+
+      when(
+        () => mockStorage.write(key: key, value: stringValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => stringValue);
+
+      await secureStorage.writeBool(key, value);
+      final result = await secureStorage.readBool(key);
+
+      expect(result, value);
+    });
+
+    test('writeBool and readBool work with false', () async {
+      const key = 'testBoolFalseKey';
+      const value = false;
+      const stringValue = 'false';
+
+      when(
+        () => mockStorage.write(key: key, value: stringValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => stringValue);
+
+      await secureStorage.writeBool(key, value);
+      final result = await secureStorage.readBool(key);
+
+      expect(result, value);
+    });
+
+    test('readBool handles case insensitive true/false', () async {
+      const key = 'caseInsensitiveKey';
+
+      // Test "TRUE"
+      when(() => mockStorage.read(key: key)).thenAnswer((_) async => 'TRUE');
+      expect(await secureStorage.readBool(key), true);
+
+      // Test "False"
+      when(() => mockStorage.read(key: key)).thenAnswer((_) async => 'False');
+      expect(await secureStorage.readBool(key), false);
+    });
+
+    test('readBool returns null for invalid boolean string', () async {
+      const key = 'invalidBoolKey';
+      const invalidValue = 'maybe';
+
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => invalidValue);
+
+      final result = await secureStorage.readBool(key);
+
+      expect(result, isNull);
+    });
+  });
+
+  group('SecureStorageImpl Double Tests', () {
+    test('writeDouble and readDouble work', () async {
+      const key = 'testDoubleKey';
+      const value = 3.14159;
+      const stringValue = '3.14159';
+
+      when(
+        () => mockStorage.write(key: key, value: stringValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => stringValue);
+
+      await secureStorage.writeDouble(key, value);
+      final result = await secureStorage.readDouble(key);
+
+      expect(result, value);
+    });
+
+    test('readDouble returns null for invalid double string', () async {
+      const key = 'invalidDoubleKey';
+      const invalidValue = 'not_a_double';
+
+      when(
+        () => mockStorage.read(key: key),
+      ).thenAnswer((_) async => invalidValue);
+
+      final result = await secureStorage.readDouble(key);
+
+      expect(result, isNull);
+    });
+  });
+
+  group('SecureStorageImpl Utility Tests', () {
+    test('containsKey returns true for existing key', () async {
+      const key = 'existingKey';
+
+      when(
+        () => mockStorage.containsKey(key: key),
+      ).thenAnswer((_) async => true);
+
+      final exists = await secureStorage.containsKey(key);
+
+      expect(exists, isTrue);
+      verify(() => mockStorage.containsKey(key: key)).called(1);
+    });
+
+    test('containsKey returns false for non-existent key', () async {
+      const key = 'nonExistentKey';
+
+      when(
+        () => mockStorage.containsKey(key: key),
+      ).thenAnswer((_) async => false);
+
+      final exists = await secureStorage.containsKey(key);
+
+      expect(exists, isFalse);
+    });
+
+    test('delete removes key-value pair', () async {
+      const key = 'deleteTestKey';
+
+      when(() => mockStorage.delete(key: key)).thenAnswer((_) async {});
+
+      await secureStorage.delete(key);
+
+      verify(() => mockStorage.delete(key: key)).called(1);
+    });
+
+    test('readAll and readAllKeys return all stored keys', () async {
+      final testData = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'};
+
+      when(() => mockStorage.readAll()).thenAnswer((_) async => testData);
+
+      final allKeys = await secureStorage.readAll();
+      final allKeysAlt = await secureStorage.readAllKeys();
+
+      expect(allKeys, containsAll(testData.keys));
+      expect(allKeys.length, testData.length);
+      expect(allKeysAlt, equals(allKeys));
+    });
+
+    test('deleteAll removes all key-value pairs', () async {
+      when(() => mockStorage.deleteAll()).thenAnswer((_) async {});
+
+      await secureStorage.deleteAll();
+
+      verify(() => mockStorage.deleteAll()).called(1);
+    });
+  });
+
+  group('SecureStorageImpl Mixed Data Type Tests', () {
+    test('different data types work correctly', () async {
+      const stringKey = 'stringKey';
+      const intKey = 'intKey';
+      const boolKey = 'boolKey';
+      const doubleKey = 'doubleKey';
+
+      const stringValue = 'hello world';
+      const intValue = 123;
+      const boolValue = true;
+      const doubleValue = 45.67;
+
+      // Mock all write operations
+      when(
+        () => mockStorage.write(key: stringKey, value: stringValue),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.write(key: intKey, value: intValue.toString()),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.write(key: boolKey, value: boolValue.toString()),
+      ).thenAnswer((_) async {});
+      when(
+        () => mockStorage.write(key: doubleKey, value: doubleValue.toString()),
+      ).thenAnswer((_) async {});
+
+      // Mock all read operations
+      when(
+        () => mockStorage.read(key: stringKey),
+      ).thenAnswer((_) async => stringValue);
+      when(
+        () => mockStorage.read(key: intKey),
+      ).thenAnswer((_) async => intValue.toString());
+      when(
+        () => mockStorage.read(key: boolKey),
+      ).thenAnswer((_) async => boolValue.toString());
+      when(
+        () => mockStorage.read(key: doubleKey),
+      ).thenAnswer((_) async => doubleValue.toString());
+
+      // Store different types
+      await secureStorage.write(stringKey, stringValue);
+      await secureStorage.writeInt(intKey, intValue);
+      await secureStorage.writeBool(boolKey, boolValue);
+      await secureStorage.writeDouble(doubleKey, doubleValue);
+
+      // Retrieve and verify all types
+      expect(await secureStorage.read(stringKey), stringValue);
+      expect(await secureStorage.readInt(intKey), intValue);
+      expect(await secureStorage.readBool(boolKey), boolValue);
+      expect(await secureStorage.readDouble(doubleKey), doubleValue);
+    });
+  });
+}