Since IL is very easy to be analysed and reversed by professional decompiler such as ILSpy / .NET Reflector, it is very difficult for hackers to analyse it without protection, and the security of the game is very poor, so how to effectively encrypt Unity Mono has become an important issue for the industry.

The huge volume attracted the black and gray production, Unity developed games became the hardest hit by the attacks. Cracking and reversing tools for Unity engine are emerging, such as: reversing tools Il2CppDumper and dnSpy, resource parsing tool AssetStudio and so on.