Three years ago I made my first Android application and signed it with my keystore and uploaded on playstore.
Well that time I shared my keystore with my college friends Now I made a update for my application and I want to make it secure so no one other than me can place a update or cannot do anything wrong with my work. Well that app is published using my college account so anyone can access that account. They can't delete (college rules) but still they can experiment on my application.
Is changing the keystore password will help? Anything I can do in this situation? I have my original key with me. If there is no way to make it secure then definitely I don't want to waste my time on updating.
You cannot change your keystore. Each app is linked to one.