Add functions that do nothing, but modify the values on the fly. Make the code as spindly and kludgy as possible. Don't include the Google licensing library as a library project.

Add some new parameters to use when generating the keys. Then a user can load it on their phone with 'allow non market apps' checked.ĭon't use Google licensing as is. So to crack it you just remove the license check and re-sign with whatever cert you want. There are no checks that your signature is the one it's signed with.

The only requirement that an APK has to run is that it be signed. Their implementation however is highly flawed. Here are your best practices.ġ) Yes Google's recommendation to use code obfuscation, signed coded, and their license verification server is designed to prevent software theft. Ultimately the built in protection of apps in Android is very poor. Has anybody tried this approach on apk files? Care to share your experiences? exe file and calculates the byte sum, compares it with the integer after the signature. exe is created, I used a tool to calculate the sum of byte contents of the file, then stuff it into somewhere in the file, for example, 4 bytes after a text pattern 'MY SIGNATURE'. exe programs, I used to use a checksum to determine if the file has been altered. Am I wrong that signing an apk file is designed to keep people from tampering with the file content?

But still, they modified the code and took out the licensing check part. Question #1: I signed the apk file according to Google's instructions. I used ProGuard to obfuscate it, but that doesn't discourage the hackers. I used Android Vending Licensing in the program, but the cracked version does not do licensing check at all. But this is not my case, the cracked version still uses the same package name. There are posts here saying people can change the package name and republish an apk.

I downloaded it from there, and it does run fine on my device! I've just released an app, a paid app, 4 days later a user told me there's another web site in China hosts my app.

Best place for cracked apps apk piracy