Re: Clever ways to hide a compare
- From: "Aslan" <spamtrap@xxxxxxxxxx>
- Date: Sun, 25 Sep 2005 18:59:57 +0000 (UTC)
David J. Craig yazdi:
> Depending upon the register/data size, you can use a subtract, add,
> multiply, or divide. You can do a translate and come up with some
> interesting possibilities. If this is DOS and not Windows NT, you can have
> self modifying code that can do wonderful things. Translate an instruction
Isn't is possible under Windows NT? How 'bout a buffer overflow attack
against your code on purpose? Is it a good idea or bad idea?
> to something good if the value is good. Otherwise change it to something
> that will lead to headaches.
>
> "jonathon" <spamtrap@xxxxxxxxxx> wrote in message
> news:1127603005.082317.85010@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > Suppose you are writing a protection scheme, and need to compare 2
> > values. Is there a clever way to do this without an outright 'cmp'
> > instruction? Of course it's always possible to use the value in a
> > calculation that is needed for correct functionality of the program,
> > but I was wondering if there is a way to have 2 values compared in a
> > sneaky way where it is not immediately evident what is happening.
> >
.
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