Enigma can encrypt the text in three touches. Enigma is available for both iOS and Mac computers. Agree with the interlocutor about your "Key" encryption, (for example the number "563"), and it will be able to decrypt your message.
Get the setup package of Enigma 1.1 that is absolutely free and take a look at users' reviews on Droid Informer. The app can be launched flawlessly on Android 4.0 and higher. This download is completely secure. Muslim Kushiev is the official developer of this application that can be found in the Tools category.