I have an idea like I will make an app which will work like this : on opening app you see slide guide you can do next slides or skip then you will see main interface where there will be option to set random cipher key (encryption key) you want. Then a button to start on clicking it app minimizes and converts to a tool overlay that has cipher key selection, encryption button, deencryption button, and close. Like I will open whatsapp or instagram or facebook or any app, say whatsapp then type my message in input box and click encrypt then all text in message will be converted to hash text like "hello how are you "--> "h@4sjHsy/+4h" that is random string based on cipher key. And I will send the message then my friend will receive that encoded message and he will set the same cipher key and click dencrypt and will select area of message and click done and he will see the same message that is "hello how are you ". Also history is saved if user want of all encryption and deencryptions, For the first time you may seem the action as to long and time taking but its not that much time taking and it will come in rhythm after using it for some time. Please let me know should I work on it and what are problems with it and also I have not that much app development knowledge I mean I have very basic so if you want to help me to develop my app can let me know
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