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OllyDbg is often used for reverse engineering of programs. [9] It is often used by crackers to crack software made by other developers. For cracking and reverse engineering, it is often the primary tool because of its ease of use and availability; any 32-bit executable can be used by the debugger and edited in bitcode/assembly in realtime. [10]
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It covers the use of debuggers and other low-level tools for working with binaries. Of particular interest is that it uses OllyDbg in examples, and is therefore one of the few practical, modern books on the subject that uses popular, real-world tools to facilitate learning.
A shareware debugger, but free to use, OllyDbg is a 32-bit assembler-level debugger from Oleh Yuschuk. However, it can only be used for user-mode debugging. An open source kernel debugger similar to SoftICE named Rasta Ring 0 Debugger (RR0D) is available.
The CPU tab is the tab you will most frequently use. It contains the assembly code of the file you dragged in. You are able to insert breakpoints labelled as grey circles to the left of the assembly code. These are important for when you execute the file you are examining, and you want the code to pause at a certain section.
This is accomplished by reverse engineering the compiled program code using a debugger such as x64dbg, SoftICE, [20] OllyDbg, GDB, or MacsBug until the software cracker reaches the subroutine that contains the primary method of protecting the software (or by disassembling an executable file with a program such as IDA). [21]
What constitutes an acceptable defect rate depends on the nature of the software; a flight simulator video game would have much higher defect tolerance than software for an actual airplane. Although there are close links with SQA, testing departments often exist independently, and there may be no SQA function in some companies.
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