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Removing symbol for security reason
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Removing symbol for security reason


  • Subject: Removing symbol for security reason
  • From: David Gagnon <email@hidden>
  • Date: Tue, 23 Sep 2008 11:04:37 -0400
  • Thread-topic: Removing symbol for security reason

Title: Removing symbol for security reason
Hi,

We are trying to make our application more difficult to hack (remove protection). So, first step is symbol removal. I have a couple of question about this:
  • Xcode build flags does not seem to remove all symbols, so I need to use “strip” command to do a better job. Why?
  • When I remove symbols using “strip” with “-x” argument, our important symbols are removed correctly (verified with “nm” command). But, if I open our application with an hexadecimal editor, I still can find strings of our important symbols. Why?
  • Where can I find information about protecting our application correctly?

Note that I found this link:

http://lists.apple.com/archives/xcode-users/2006/Mar/msg00552.html

 It is very usefull, but I need more informations.

Thanks!

David
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