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Welcome to the Deciphering File Formats MCQs Page

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

Deciphering File Formats MCQs | Page 9 of 9

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Q81.
How are unused entries in the Cryptex file list table indicated?

a.

By setting the file size to 0

b.

By setting the first cluster index to 0

c.

By setting the file name to NULL

d.

By using a specific flag value

Discuss
Answer: (b).By setting the first cluster index to 0 Explanation:Unused entries in the Cryptex file list table are indicated by setting the first cluster index to 0.
Q82.
What is the purpose of the MD5 hash stored in each file entry in the Cryptex file list?

a.

To verify the password used to encrypt the archive

b.

To confirm the integrity of the encrypted file data

c.

To provide a unique identifier for each file entry

d.

To generate the Triple-DES key used for encryption

Discuss
Answer: (b).To confirm the integrity of the encrypted file data Explanation:The MD5 hash stored in each file entry in the Cryptex file list is used to confirm the integrity of the encrypted file data.
Q83.
What is the size of a single cluster in Cryptex archives?

a.

4,096 bytes

b.

4,104 bytes

c.

4,092 bytes

d.

4,100 bytes

Discuss
Answer: (b).4,104 bytes Explanation:The size of a single cluster in Cryptex archives is 4,104 bytes.
Q84.
How are clusters encrypted in Cryptex archives?

a.

Using the triple-DES algorithm with a key derived from the MD5 hash

b.

Using the AES algorithm with a key derived from the SHA hash

c.

Using the triple-DES algorithm with a key derived from the SHA hash

d.

Using the RSA algorithm with a key derived from the MD5 hash

Discuss
Answer: (c).Using the triple-DES algorithm with a key derived from the SHA hash Explanation:All clusters in Cryptex archives are encrypted using the triple-DES algorithm with the key derived from the SHA hash.
Q85.
What is the maximum length of a file name in Cryptex archives?

a.

64 bytes

b.

128 bytes

c.

256 bytes

d.

512 bytes

Discuss
Answer: (b).128 bytes Explanation:The maximum length of a file name in Cryptex archives is 128 bytes.
Q86.
How are file entries linked in Cryptex archives?

a.

Using a linked list data structure

b.

Using a hash table data structure

c.

Using a binary tree data structure

d.

Using a sequential cluster sequence

Discuss
Answer: (d).Using a sequential cluster sequence Explanation:Files are stored in cluster sequences that are linked using the “next cluster” member in offset +0 inside each cluster.
Q87.
How does Cryptex accurately reconstruct the file size during the extraction process?

a.

By storing the file size in each cluster

b.

By storing the file size in the file entry

c.

By storing the file size in the first cluster of each file chain

d.

By storing the number of clusters in the file entry

Discuss
Answer: (c).By storing the file size in the first cluster of each file chain Explanation:The last cluster in each file chain contains the exact number of bytes that are actually in use within the current cluster. This allows Cryptex to accurately reconstruct the file size during the extraction process because the file entry only contains the file size in clusters.
Q88.
What can be achieved through reverse engineering?

a.

Writing code that deciphers proprietary data

b.

Generating compatible data

c.

Both a and b

d.

None of the above

Discuss
Answer: (c).Both a and b Explanation:Reverse engineering techniques can be used to analyze and understand undocumented program data such as proprietary file formats or network protocols, and use that knowledge to write code that deciphers such data or even code that generates compatible data.
Q89.
Can code-level reversing provide answers regarding a program's data format and structure?

a.

Yes

b.

No

c.

May be Yes or No

d.

Can't say

Discuss
Answer: (a).Yes Explanation:Code-level reversing can provide almost all the answers regarding a program's data format and structure. By analyzing the program's code, you can understand how data is stored, accessed, and manipulated, which can help you decipher proprietary data formats and generate compatible data.
Q90.
What is the easiest way to check Cryptex's password verification process?

a.

Start Cryptex in a debugger, feeding it with an incorrect password and try to catch the place in the code where Cryptex notifies the user that a bad password has been supplied.

b.

Analyze the source code of Cryptex to find out how it verifies the password.

c.

Launch Cryptex without a debugger and try to guess the correct password.

d.

None of the above.

Discuss
Answer: (a).Start Cryptex in a debugger, feeding it with an incorrect password and try to catch the place in the code where Cryptex notifies the user that a bad password has been supplied. Explanation:The easiest way to check Cryptex's password verification process is to start Cryptex in a debugger, feeding it with an incorrect password and try to catch the place in the code where Cryptex notifies the user that a bad password has been supplied.
Page 9 of 9

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