How to store sensitive data into java code for android development

Question

I am willing to use java email api for my android app. I got it from this link . But as mentioned here in the link, to use this api, I need to give my own email id and password in GmailSender as Plain Text . For this reason I am tensed about my password. If anyone decompile the apk file then he can easily get my email id and password. But I don't know how to store these sensitive data into my code safely. How can I do this?

Note: I am not willing to use any third party library to encrypt thses data

Answer 1

It is nearly impossible to completely protect your app from reversal engineering, especially without any third party library.

BUT instead you can create another e-mail, with a different password, and configure it to resend any email received to your official e-mail.

This way if anyone actually manage to reverse the code and get the password, they will only have access to this secondary and unimportant e-mail account. This should solve the problem.

More info about actually protecting the code here:

How to avoid reverse engineering of an APK file?

How to make apk Secure. Protecting from Decompile

Answer 2

You should obfuscate your password string before keeping it in your source code. You can:

• Do it manually, It can be take a time.
• Or use some automatic tools. If you don't want to use any third party library to encrypt these data, Bg+ Anti Decompiler/Obfuscator is a good choice for you. It works on java source code (not Java byte-code) so you will control everything