yeah but how can you tell APK file is original or not?? that was the point
you can't tell....that is the thing. a file is just a file. there is no origins within any file to tell where it came from. it does not matter what kind of file it is. you can only trust the site that is offering such files.
I had checked and asked some others about this problem, actually, they said we can tell it by using security software or test device, some pros may tell by analysing the code but it gets pretty hard for normal to do that.
actually i dont know how to express correctly but an origin file is file that was contained in Google Play Store and some may try to disturb it by adding some code lines or anything for example to drive you into an advertisement.
No, I talked about using test devices as a way of checking for malware, or security software to scan for known malware signatures. That isn't the same as verifying the origin of the apk. And you don't get source code from the Play Store, though for FOSS apps it is available from the developers. I did say that if you know the checksum of the original apk it's easy to test that it's identical, but you are unlikely to have that.
Well that's more of a simple question to a complex issue. There's little you can do to verify any APK you install is definitively the exact same duplicate file the original developer(s) created, unless you do something like use their source code (easier if the APK is Open Sourced, a daunting task if not) to make your own APK and then do a one-to-one comparison between your APK and the target APK.
