There are many encryption algorithms and most of them require IV and KEY and Plaintext.
In Android, we have to add 3 of them to our code. On the other side, Android is open source and everyone can extract APK files and access the IV and the KEY , this doesn't make it secure.
Which algorithms are better and unbreakble that can be applied in Java and PHP. I'm working on a Project similar to Instagram/Facebook/Twitter, Security is the first problem for such applications.