Welcome to the Deciphering Program Data MCQs Page

Dive deep into the fascinating world of Deciphering Program Data with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Deciphering Program Data, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Deciphering Program Data, 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 Deciphering Program Data. 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 Deciphering Program Data. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Deciphering Program Data MCQs | Page 2 of 11

Explore more Topics under Reverse Engineering

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Introduction to Reverse Engineering

02

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04

Reversing Tools 🔒

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06

Deciphering File Formats

07

Auditing Program Binaries 🔒

08

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11

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12

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Deciphering Code Structures 🔒

15

Understanding Compiled Arithmetic

Q11.

What is the purpose of calling conventions in a program?

To define how functions are called

To define how data is arranged on the stack

To define how to decipher a program

Both a and b

Discuss

Answer: (d).Both a and b Explanation:Calling conventions are used to define how functions are called in a program and how data is arranged on the stack during a function call.

Q12.

What is the function of the CALL instruction?

Pushes the current instruction pointer onto the stack and performs an unconditional jump into the new code address.

Pops the return address into the EIP register.

Sets up a stack frame by pushing EBP into the stack and setting it to point to the top of the local variable area.

Restores ESP and EBP to their previously stored values.

Discuss

Answer: (a).Pushes the current instruction pointer onto the stack and performs an unconditional jump into the new code address. Explanation:The CALL instruction pushes the current instruction pointer onto the stack and performs an unconditional jump into the new code address.

Q13.

What is the function of the RET instruction?

Pushes the current instruction pointer onto the stack and performs an unconditional jump into the new code address.

Pops the return address into the EIP register.

Sets up a stack frame by pushing EBP into the stack and setting it to point to the top of the local variable area.

Restores ESP and EBP to their previously stored values.

Discuss

Answer: (b).Pops the return address into the EIP register. Explanation:The RET instruction pops the return address stored earlier by the CALL instruction into the EIP register and proceeds execution from that address.

Q14.

Why is it important to understand calling conventions when reversing a program?

To properly identify the calling conventions used in the program

To determine the structure of the program

To optimize the program's performance

To debug the program

Discuss

Answer: (a).To properly identify the calling conventions used in the program Explanation:Understanding the calling conventions used in a program can help in properly identifying the function calls and the way data is arranged on the stack during a function call, which is important in reversing a program.

Q15.

What is the unique feature of the cdecl calling convention?

It allows functions to receive a dynamic number of parameters.

It uses registers for passing the first two parameters.

It passes parameters in the reverse order compared to other calling conventions.

It requires the callee to restore the stack pointer after a function call.

Discuss

Answer: (c).It passes parameters in the reverse order compared to other calling conventions. Explanation:The unique feature of the cdecl calling convention is that it passes parameters in the reverse order compared to other calling conventions.

Q16.

What is the difference between cdecl and other calling conventions in terms of parameter passing?

cdecl uses registers for passing the first two parameters, while other calling conventions pass parameters through the stack.

cdecl passes parameters in the reverse order compared to other calling conventions.

Other calling conventions allow functions to receive a dynamic number of parameters, while cdecl does not.

Other calling conventions require the callee to restore the stack pointer after a function call, while cdecl does not.

Discuss

Answer: (b).cdecl passes parameters in the reverse order compared to other calling conventions. Explanation:The main difference between cdecl and other calling conventions in terms of parameter passing is that cdecl passes parameters in the reverse order compared to other calling conventions.

Q17.

How can you identify a cdecl function?

It ends with a simple RET with no operands.

It always uses ECX and EDX to store the first and second function parameters.

It allows functions to receive a dynamic number of parameters.

It uses registers for passing the first two parameters.

Discuss

Answer: (a).It ends with a simple RET with no operands. Explanation:You can identify a cdecl function by looking for a function that takes one or more parameters and ends with a simple RET with no operands.

Q18.

What is the fastcall calling convention?

A calling convention that uses registers for passing the first two parameters passed to a function.

A calling convention that allows functions to receive a dynamic number of parameters.

A calling convention that passes parameters in the reverse order compared to other calling conventions.

A calling convention that requires the callee to restore the stack pointer after a function call.

Discuss

Answer: (a).A calling convention that uses registers for passing the first two parameters passed to a function. Explanation:The fastcall calling convention is a calling convention that uses registers for passing the first two parameters passed to a function.

Q19.

What is the stdcall calling convention?

A common C and C++ calling convention that allows functions to receive a dynamic number of parameters.

A higher-performance calling convention that uses registers for passing the first two parameters passed to a function.

A calling convention commonly used in Windows that is the opposite of cdecl in terms of argument passing method and order.

A calling convention that is responsible for clearing the stack after a function call is made.

Discuss

Answer: (c).A calling convention commonly used in Windows that is the opposite of cdecl in terms of argument passing method and order. Explanation:The stdcall calling convention is commonly used in Windows and is the opposite of cdecl in terms of argument passing method and order. It is used by every Windows API and system function, and stdcall functions are responsible for clearing their own stack.

Q20.

What is the C++ Class Member Calling Convention called?

cdecl

stdcall

fastcall

thiscall

Discuss

Answer: (d).thiscall Explanation:The C++ Class Member Calling Convention is commonly known as "thiscall".

Page 2 of 11

Low Level Software 🔒

Windows Fundamentals 🔒

Reversing Tools 🔒

Auditing Program Binaries 🔒

Reversing Malware 🔒

Antireversing Techniques 🔒

Breaking Protections 🔒

Reversing .NET 🔒

Deciphering Code Structures 🔒

Welcome to the Deciphering Program Data MCQs Page

Deciphering Program Data MCQs | Page 2 of 11

Explore more Topics under Reverse Engineering

Introduction to Reverse Engineering

Beyond the Documentation

Deciphering File Formats

Piracy and Copy Protection

Decompilation

Understanding Compiled Arithmetic

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