iOS How is game code encrypted?

When you build, Xcode creates a binary with your code. No one will ever see that code. The resources are wide open though. Every image and sound you use can be easily copied off the app.

happycamper66 said:

Has there been ANY record of anyone actually "reverse engineering" the code? Getting it back from binary code?

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When you compile your code, the objective-c is turned into equivalent ARM machine code instructions. These machine code instructions can be translated directly into ARM assembly instructions, which are slightly more readable by a human than the machine code. It is still pretty tedious to figure out what this code is doing, but it's certainly possible. Your exact objective-c code can't be directly recovered from the machine code.

You guys might be interested in this

http://ericasadun.com/iPhoneDocs312/index.html

Click on the files link and look at some of the header files.

You can't reverse engineer "the code" HLL source from the compiled binary exactly, but there are often ways to reverse engineer a form of source code that will pretty much create the same app, even though it may not be structured or easy to read.

It's a lot easier to reverse compile more restrictive languages such as Java, than for wild spaghetti C code. Objective C is a mix of those two extremes, so it depends on how (badly) you write your source code.

Objective C apps publish their method names for the language's dynamic dispatch to work. If you don't want method calls to be seen, use straight C functions instead, or even inline macros, and make sure to turn off or strip symbol generation.

Library headers are easy to extract because they HAVE TO publish the interface names in some form in order to be linked.

etc.