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Exploiting Binary level Code Virtualization to Protect Android Applications Against App Repackaging

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Figure

FIGURE 1: Summary of prior code protection schemes their corresponding attacks for Android apps
FIGURE 2: Comparison before and after reverse peeling.Red-marked instructions represent encrypted, unrecognizedinstructions.
FIGURE 3: Overview of CodeCloak. The middle area highlighted by gray rectangle shows ARM stack-based virtualization, in-cluding pre-processing, key instruction extraction, multiple virtualizations, building and embedding the interpreter VMSection.zThe VMSection is executed as following steps: x Jump into the virtual machine; y Initialize the VM, enter the Dispatcher; Read the virtual instruction bytecodes; { Dispatch handlers to process bytecodes; | Exit the virtual machine; } Go to thesubsequent instructions to continue execution.
TABLE 1: An example of NI and Corresponding structure.
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