Welcome to the Decompilation MCQs Page

Dive deep into the fascinating world of Decompilation with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Decompilation, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Decompilation, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Reverse Engineering.

Check out the MCQs below to embark on an enriching journey through Decompilation. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Decompilation. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Decompilation MCQs | Page 10 of 11

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Q91.

What is the purpose of identifying library functions during decompilation?

To increase the size of the decompiler's output

To improve the quality and relevance of the decompiler's output

To create new library functions

To slow down the decompilation process

Discuss

Answer: (b).To improve the quality and relevance of the decompiler's output Explanation:By identifying library calls, unnecessary and redundant code can be eliminated, and the quality and relevance of the decompiled output can be improved.

Q92.

What are the benefits of properly identifying library calls?

It eliminates library code

It improves the readability of the decompiled output

It provides accurate type information for library calls

All of the above

Discuss

Answer: (d).All of the above Explanation:Properly identifying library calls eliminates library code, improves the readability of the decompiled output, and provides accurate type information for library calls.

Q93.

How are library functions identified during decompilation?

By scanning the executable for byte sequences that represent the first few bytes of each function in the library

By manually examining the executable for library calls

By using a hash to identify library functions

By ignoring all functions in the executable

Discuss

Answer: (a).By scanning the executable for byte sequences that represent the first few bytes of each function in the library Explanation:Library functions are identified by scanning the executable for byte sequences that represent the first few bytes of each function in the library.

Q94.

What happens to library functions once they are identified during decompilation?

They are ignored and not decompiled

They are decompiled like any other function

They are optimized to improve the quality of the decompiled output

They are converted into new library functions

Discuss

Answer: (a).They are ignored and not decompiled Explanation:Once library functions are identified during decompilation, they are generally ignored and not decompiled. The details regarding their data types are incorporated into the type-analysis process.

Q95.

Is the back end of a decompiler interchangeable?

Yes, it can be fairly easily replaced to get the decompiler to produce different high-level language outputs.

No, the back end is fixed and cannot be changed.

Only certain parts of the back end can be replaced.

It depends on the specific decompiler.

Discuss

Answer: (a).Yes, it can be fairly easily replaced to get the decompiler to produce different high-level language outputs. Explanation:Just as a compiler’s back end is interchangeable to allow the compiler to support more than one processor architecture, so is a decompiler’s back end. It can be fairly easily replaced to get the decompiler to produce different high-level language outputs.

Q96.

Which instructions are fairly trivial to process in the back end of a decompiler?

Assignment instructions

Call instructions

Ret instructions

All of the above

Discuss

Answer: (d).All of the above Explanation:Instructions such as the assignment instruction, call instruction, and ret instruction are fairly trivial to process in the back end of a decompiler.

Q97.

What is the most complex step in the process of creating high-level language code from the control flow graph?

Analyzing the conditions in two-way or n-way conditionals

Choosing the most suitable high-level language constructs for representing the control flow graph

Creating loop constructs such as “do...while”, “while...”, and “for...” loops

Representing unstructured elements in the control flow graph using goto statements

Discuss

Answer: (b).Choosing the most suitable high-level language constructs for representing the control flow graph Explanation:The most complex step in the process of creating high-level language code from the control flow graph is choosing the most suitable high-level language constructs for representing the control flow graph.

Q98.

What is the current state of IA-32 decompilers?

There are many fully functional decompilers available

There are no functional decompilers available

There are only partially functional decompilers available

There are many decompilers available, but they are not compatible with IA-32 architecture

Discuss

Answer: (c).There are only partially functional decompilers available Explanation:There are not many fully functional IA-32 decompilers available currently, and the two that are in development are only partially usable.

Q99.

What is the potential benefit of a working native code decompiler?

It can produce an exact copy of the original source code.

It can make the reversing process unnecessary.

It can produce an approximation of the original source code and decrease the time it takes to understand a complex program.

It can automatically generate high-level language code from executable binaries.

Discuss

Answer: (c).It can produce an approximation of the original source code and decrease the time it takes to understand a complex program. Explanation:A working native code decompiler could produce an approximation of the original source code and dramatically decrease the time it takes to understand a complex program.

Q100.

What is the purpose of a decompiler?

To improve the program's performance

To produce a binary executable

To produce a high-level language representation from a binary executable

To create a low-level intermediate representation of a program

Discuss

Answer: (c).To produce a high-level language representation from a binary executable Explanation:The purpose of a decompiler is to produce a high-level language representation from a binary executable, which is why option c) is correct. Option a) is incorrect because a decompiler doesn't have an optimizing stage. Option b) is incorrect because a binary executable is what a decompiler is analyzing, not producing. Option d) is incorrect because the decompiler is aiming to produce a high-level language representation, not a low-level one.

Page 10 of 11

Low Level Software 🔒

Windows Fundamentals 🔒

Reversing Tools 🔒

Auditing Program Binaries 🔒

Reversing Malware 🔒

Antireversing Techniques 🔒

Breaking Protections 🔒

Reversing .NET 🔒

Deciphering Code Structures 🔒

Deciphering Program Data 🔒

Welcome to the Decompilation MCQs Page

Decompilation MCQs | Page 10 of 11

Explore more Topics under Reverse Engineering

Introduction to Reverse Engineering

Beyond the Documentation

Deciphering File Formats

Piracy and Copy Protection

Understanding Compiled Arithmetic

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