Obfuscating C-based binaries to avoid decompilation

Question

Is there some way to obfuscate C-based executables or libraries to prevent decompilation?

Answer 1

One way to make things slightly more difficult is to pack them. UPX will pack your binaries which makes it harder to decompile out of the box. Technically it's possible to unpack and then decompile but it will raise the bar a bit. Assuming you're running on a vanilla user operating system there isn't a whole lot you can do to prevent decompilation without using nasty tricks.