Enter the text you want to encrypt and enter the password (Key). After specifying the key, IV is automatically generated. Then click "Encrypt" and finally, the encrypted text will be saved to external storage.
To decrypt the file, you need to enter the password, select the encrypted text (encrypted file) and click on the "Decrypt" button. If the key is entered correctly, the decrypted text will be shown on the screen. In addition, you can save this text to external storage by clicking on the "Save text as file" button.