Surreptitious Software: Obfuscation, Watermarking, and Tamperproofing for Software Protection by Nagra Jasvir & Collberg Christian
Author:Nagra, Jasvir & Collberg, Christian [Nagra, Jasvir]
Language: eng
Format: epub
Publisher: Addison-Wesley Professional
Published: 2009-07-23T23:00:00+00:00
At the end of mutation round 3, upper memory gets xored with lower memory, and you pick C4 to contain P3 in cleartext:
At runtime, after executing the code in cell C4, in mutation round 4, lower memory gets xored with upper memory. You pick C2 to contain P4 in cleartext:
Since, at this point, C2 contains IV2 ⊕ IV5, you add the equation IV2 ⊕ IV5 = P4 to E2. Now it’s entirely possible that as you add equations to E2 it becomes non-invertible, i.e., there’s no way to solve it for initial values IV0, ...,IV5. In that case, you’ll need to backtrack and pick another cell to contain the next cleartext subprogram.
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