Re: Removing symbol for security reason
Re: Removing symbol for security reason
- Subject: Re: Removing symbol for security reason
- From: Jean-Daniel Dupas <email@hidden>
- Date: Tue, 23 Sep 2008 17:27:47 +0200
Le 23 sept. 08 à 17:04, David Gagnon a écrit : 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!
Are you building an Obj-C app or a C/C++ App. Obj-C runtime require methods and class names to works (this is the cost of dynamic binding), so it's not possible to remove all strings from the binary.
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