To encrypt and decrypt strings in a React Native Expo Mobile Web application, follow these steps:

Install Library: Use crypto-js, which supports both Expo-managed and React Native web apps.

Install with: npm install crypto-js. Encryption:

Use a secret key to encrypt text using AES encryption. Example: Pass plain text and a secret key to create an encrypted string. Decryption:

Use the same secret key to decrypt the encrypted string back into plain text. Security Considerations:

Use a strong, securely stored secret key (e.g., Expo SecureStore). Ensure your app communicates over HTTPS to prevent data interception. With these steps, you can securely handle encrypted data in your app.