Here is another app in tools, Encrypt and Send. It's a simple application, but at the same time practical and easy to encrypt a message and send it to the recipient via e-mail, SMS, Bluetooth or otherwise. The application allows you to read the contents of the message only if you know the key. Any use morally wrong is not recommended (such as communication with the lover) . It is also useful to keep your passwords. Look for it in: https://play.google.com/store/apps/...l0LmVuY3J5cHRhbmRzZW5kLnZpZXdjb250cm9sbGVyIl0.