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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.

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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 6 of 7

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Q51.
What is the advantage of generating decryption keys in runtime?

a.

The program becomes more efficient

b.

The program can never be automatically unpacked

c.

The program becomes more secure from malware

d.

The program becomes faster

Discuss
Answer: (b).The program can never be automatically unpacked Explanation:Generating decryption keys in runtime is important because it means that the program could never be automatically unpacked.
Q52.
What are interdependent keys?

a.

Keys that are calculated in runtime from some other program data

b.

Keys that are hard-coded into the program

c.

Keys that are generated by the processor

d.

Keys that are stored in a centralized location

Discuss
Answer: (a).Keys that are calculated in runtime from some other program data Explanation:Interdependent keys are keys that are calculated in runtime from some other program data.
Q53.
How does Defender use interdependent keys?

a.

To encrypt individual functions

b.

To encrypt the entire program

c.

To decrypt individual functions

d.

To decrypt the entire program

Discuss
Answer: (a).To encrypt individual functions Explanation:Some of the individual functions in Defender are encrypted using interdependent keys.
Q54.
What is a cryptographic hash algorithm?

a.

An algorithm used to calculate checksums

b.

An algorithm used to generate decryption keys

c.

An algorithm used to encrypt data

d.

An algorithm used to generate random numbers

Discuss
Answer: (a).An algorithm used to calculate checksums Explanation:It would probably be worthwhile to use a cryptographic hash algorithm for the purpose of calculating checksums, in order to prevent attackers from modifying the code, and simply adding a couple of bytes that would keep the original checksum value.
Q55.
How does Defender generate decryption keys?

a.

By using interdependent keys

b.

By using dongle protection

c.

By using cryptographic hash algorithms

d.

By using user input

Discuss
Answer: (a).By using interdependent keys Explanation:Defender generates decryption keys in runtime using interdependent keys.
Q56.
What is the purpose of dongle protection?

a.

To encrypt the program code

b.

To make the program code inaccessible

c.

To make the program code only accessible with a key

d.

To prevent crackers from accessing the program code

Discuss
Answer: (c).To make the program code only accessible with a key Explanation:Dongle protection uses a key that is only available on the dongle to make the program code only accessible with the key.
Q57.
Why was the Chained Block Cipher in Defender crackable?

a.

Because it used short 32-bit keys

b.

Because it used long 64-bit or 128-bit keys

c.

Because it used user input for decryption

d.

Because it used a cryptographic hash algorithm

Discuss
Answer: (a).Because it used short 32-bit keys Explanation:The Chained Block Cipher in Defender was crackable because it used short 32-bit keys.
Q58.
What would make cracking Defender more difficult?

a.

Using longer keys

b.

Using shorter keys

c.

Using a secret algorithm for computing the key

d.

Using user input for computing the key

Discuss
Answer: (a).Using longer keys Explanation:If longer 64-bit or 128-bit keys were used, cracking Defender wouldn't have been possible without a valid serial number.
Q59.
What is the disadvantage of user-input-based decryption keys?

a.

They are difficult to compute

b.

They are easy to keep secret

c.

They require a valid serial number

d.

They become less secure once the key computation algorithm is known

Discuss
Answer: (d).They become less secure once the key computation algorithm is known Explanation:User-input-based decryption keys become less secure once the algorithm for computing the key is known, as it would only take a single valid serial number to find out the key that was used for encrypting the important code chunks.
Q60.
Why is generating decryption keys in runtime important?

a.

To prevent the program from being automatically unpacked

b.

To make the program run faster

c.

To increase the program's memory usage

d.

To make the program more readable

Discuss
Answer: (a).To prevent the program from being automatically unpacked Explanation:Generating decryption keys in runtime is important because it means that the program could never be automatically unpacked.
Page 6 of 7

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