Welcome to the Breaking Protections MCQs Page

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

Breaking Protections MCQs | Page 5 of 7

Explore more Topics under Reverse Engineering

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Introduction to Reverse Engineering

02

Low Level Software 🔒

03

Windows Fundamentals 🔒

04

Reversing Tools 🔒

05

Beyond the Documentation

06

Deciphering File Formats

07

Auditing Program Binaries 🔒

08

Reversing Malware 🔒

09

Piracy and Copy Protection

10

Antireversing Techniques 🔒

11

Reversing .NET 🔒

12

Decompilation

13

Deciphering Code Structures 🔒

14

Understanding Compiled Arithmetic

15

Deciphering Program Data 🔒

Q41.

What is the purpose of the Processor Time-Stamp Verification Thread in Defender?

To monitor the hardware time-stamp counter and prevent the process from being stopped by a debugger.

To encrypt each key function in the program.

To make the process of live debugging easier.

To hook or replace the function that obtains the hardware time-stamp counter value.

Discuss

Answer: (a).To monitor the hardware time-stamp counter and prevent the process from being stopped by a debugger. Explanation:The purpose of the Processor Time-Stamp Verification Thread in Defender is to monitor the hardware time-stamp counter and prevent the process from being stopped by a debugger.

Q42.

Why is it important to directly access the hardware time-stamp counter using a low-level instruction in the Processor Time-Stamp Verification Thread?

So that the program can be loaded in a disassembler and the code can be easily read.

So that crackers cannot hook or replace the function that obtains the value.

So that live debugging can be performed more easily.

So that the program can be run on different hardware configurations.

Discuss

Answer: (b).So that crackers cannot hook or replace the function that obtains the value. Explanation:The direct access to the hardware time-stamp counter using a low-level instruction such as RDTSC makes it difficult for crackers to hook or replace the function that obtains the value, which helps to make the process of live debugging on the protected application more difficult.

Q43.

What would happen if the encryption on each key function was not implemented in the Processor Time-Stamp Verification Thread?

The program would not be able to run on different hardware configurations.

The program would be easier to crack by loading it in a disassembler and reading the code.

The verification thread would not be effective in preventing the process from being stopped by a debugger.

The function that obtains the value of the hardware time-stamp counter would not be accessible.

Discuss

Answer: (b).The program would be easier to crack by loading it in a disassembler and reading the code. Explanation:If encryption was not implemented on each key function in the Processor Time-Stamp Verification Thread, the program would be easier to crack by loading it in a disassembler and reading the code. Without encryption, the verification thread would not be effective in preventing reverse engineering.

Q44.

What modifications can be made to a time-stamp verification thread to make it more difficult to remove?

Adding periodical checksum calculations from the main thread that verify the verification thread.

Storing checksums within the code, rather than in some centralized location.

Inlining the actual checksum verifications.

All of the abbove

Discuss

Answer: (d).All of the abbove Explanation:The modifications that can be made to a time-stamp verification thread to make it more difficult to remove are adding periodical checksum calculations from the main thread that verify the verification thread, storing checksums within the code, rather than in some centralized location, inlining the actual checksum verifications, and storing a global handle to the verification thread.

Q45.

Is the current implementation of the verification thread safe for commercial use?

Yes

May be Yes or No

Can't say

Discuss

Answer: (b).No Explanation:In its current implementation, the verification thread is slightly dangerous. It is reliable enough for a cracking exercise, but not for anything beyond that.

Q46.

What changes should be made to the counter constant in a commercial product environment?

It should be significantly lower

It should be significantly higher

It should remain the same

It should be calculated based on the counter's update speed

Discuss

Answer: (b).It should be significantly higher Explanation:In a commercial product environment, the counter constant should probably be significantly higher.

Q47.

What priority should the verification thread be set to in a commercial product environment?

Normal priority

Low priority

High priority

It does not matter

Discuss

Answer: (c).High priority Explanation:In a commercial product environment, the thread should be set to a higher priority in order to make sure higher priority threads don't prevent it from receiving CPU time and generate false positives.

Q48.

What is the purpose of adding periodical checksum calculations from the main thread?

To verify the verification thread.

To patch the verification thread.

To store checksums within the code.

To terminate the program immediately.

Discuss

Answer: (a).To verify the verification thread. Explanation:Adding periodical checksum calculations from the main thread can verify the verification thread.

Q49.

Why should the actual checksum verifications be inlined?

To make it easier to eliminate the checks.

To make it easier to modify the checksum.

To make it more difficult to eliminate the checks or modify the checksum.

None of the above.

Discuss

Answer: (c).To make it more difficult to eliminate the checks or modify the checksum. Explanation:Inlining the actual checksum verifications would make it very difficult to eliminate the checks or modify the checksum.

Q50.

What should be done with the verification thread in a commercial product environment?

The counter constant should be lower.

The thread should be set to a lower priority.

The counter constant should be higher and should probably be calculated in runtime based on the counter’s update speed.

The thread should be set to a lower priority to ensure it receives CPU time.

Discuss

Answer: (c).The counter constant should be higher and should probably be calculated in runtime based on the counter’s update speed. Explanation:In a commercial product environment, the counter constant should probably be higher and should probably be calculated in runtime based on the counter’s update speed.

Page 5 of 7

Low Level Software 🔒

Windows Fundamentals 🔒

Reversing Tools 🔒

Auditing Program Binaries 🔒

Reversing Malware 🔒

Antireversing Techniques 🔒

Reversing .NET 🔒

Deciphering Code Structures 🔒

Deciphering Program Data 🔒

Welcome to the Breaking Protections MCQs Page

Breaking Protections MCQs | Page 5 of 7

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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