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Program Hides Secret Messages in Executables
Kevin Poulsen, SecurityFocus 2003-02-24

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Re: Program Hides Secret Messages in Executables 2003-03-02
Paul Hsieh
The following two instructions:

Add REG, CONST

Sub REG, -CONST

are *NOT* equivalent! They set the carry flag in opposite directions. I think this guy is just getting lucky in that most programs don't check the carry flag. However, source that looks like this:

A -= 3;

if (A > 0)...

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