1const SecureStorage = {
2  encryptionKey: 'mySecretKey123',
3  
4  async savePreference(key, value) {
5    try {
6      const encryptedValue = await this.encrypt(value);
7      await AsyncStorage.setItem(
8        key,
9        JSON.stringify({
10          value: encryptedValue,
11          timestamp: Date.now()
12        })
13      );
14      return true;
15    } catch (error) {
16      console.error('Storage error:', error);
17      return false;
18    }
19  },
20  
21  async getPreference(key) {
22    try {
23      const data = await AsyncStorage.getItem(key);
24      if (!data) return null;
25      
26      const { value, timestamp } = JSON.parse(data);
27      const decryptedValue = await this.decrypt(value);
28      return decryptedValue;
29    } catch (error) {
30      console.error('Retrieval error:', error);
31      return null;
32    }
33  },
34  
35  async encrypt(value) {
36    // Encryption implementation
37    return btoa(value + this.encryptionKey);
38  },
39  
40  async decrypt(encryptedValue) {
41    // Decryption implementation
42    const decoded = atob(encryptedValue);
43    return decoded.replace(this.encryptionKey, '');
44  }
45};