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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 7 of 9

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Q61.
Why doesn't Cryptex store the SHA result directly into the file header?

a.

Because it is impossible to extract the original plaintext password from the SHA hash value

b.

Because it would make it incredibly easy to decrypt Cryptex archives

c.

Because someone would be able to covert the MD5 hash value to an equivalent SHA hash value and effectively obtain the decryption key

d.

Because the SHA hash is directly used as the encryption key

Discuss
Answer: (b).Because it would make it incredibly easy to decrypt Cryptex archives Explanation:Storing the SHA hash in the file header would make it incredibly easy to decrypt Cryptex archives.
Q62.
What is the importance of studying the Cryptex directory layout?

a.

It is important for a security-level analysis of Cryptex

b.

It is important for anyone interested in reading or creating Cryptex-compatible archives

c.

It is important to find the location in the Cryptex code that reads the encrypted directory layout data

d.

It is important to decipher the directory layout

Discuss
Answer: (b).It is important for anyone interested in reading or creating Cryptex-compatible archives Explanation:In a real-world program, the directory layout would be less relevant for those interested in a security-level analysis for Cryptex, but it would be very important for anyone interested in reading or creating Cryptex-compatible archives.
Q63.
How can you decipher the directory layout in Cryptex?

a.

By finding the location in the Cryptex code that reads the encrypted directory layout data

b.

By placing a breakpoint on the ReadFile API and tracing forward in the program

c.

By decrypting the encrypted directory layout data

d.

By analyzing the Cryptex password and encryption key management code

Discuss
Answer: (b).By placing a breakpoint on the ReadFile API and tracing forward in the program Explanation:Placing a breakpoint on ReadFile and tracing forward in the program can help in deciphering the directory layout in Cryptex.
Q64.
What is the Cryptex directory layout?

a.

It is a complex data structure.

b.

It is not relevant for security-level analysis.

c.

It is important for creating Cryptex-compatible archives.

d.

It is important for those interested in reading Cryptex-compatible archives.

Discuss
Answer: (c).It is important for creating Cryptex-compatible archives. Explanation:The directory layout is important for anyone interested in reading or creating Cryptex-compatible archives.
Q65.
How can you decipher the directory layout of Cryptex?

a.

By placing a breakpoint on the ReadFile API and tracing forward in the program.

b.

By restricting the ReadFile breakpoint to calls made on the archive file.

c.

By letting Cryptex run until it reaches the key-generation function and then stepping through the code until you reach interesting code areas that decipher the directory data structures.

d.

All of the above.

Discuss
Answer: (d).All of the above. Explanation:Multiple approaches to deciphering the directory layout, including placing a breakpoint on the ReadFile API and tracing forward, restricting the ReadFile breakpoint to calls made on the archive file, and letting Cryptex run until it reaches the key-generation function and then stepping through the code until you reach interesting code areas that decipher the directory data structures.
Q66.
How can you reduce the number of calls when using a breakpoint on the ReadFile API?

a.

By only breaking when the specific handle to the Cryptex archive is specified.

b.

By restricting the breakpoint to calls made on the system.

c.

By only breaking when the specific handle to the archive file is specified.

d.

By only breaking when the specific handle to the Cryptex executable is specified.

Discuss
Answer: (a).By only breaking when the specific handle to the Cryptex archive is specified. Explanation:You could reduce the number of calls by placing a selective breakpoint on ReadFile that only breaks when the specific handle to the Cryptex archive is specified.
Q67.
Where should you place your breakpoint in a real program to avoid tedious task of stepping through the program?

a.

At the end of the key-generation function.

b.

At the beginning of the key-generation function.

c.

At the end of the archive opening function.

d.

At the beginning of the archive opening function.

Discuss
Answer: (c).At the end of the archive opening function. Explanation:Placing a breakpoint at the end of the key-generation function, and then stepping through several irrelevant code sequences, including a call into a function that apparently performs the actual opening of the archive and ends up calling into a function that appears to be what you're looking for.
Q68.
What kind of compiler switch was most likely used to compile Cryptex?

a.

optimize-for-fast-code switch

b.

optimize-for-small-code switch

c.

optimize-for-low-memory switch

d.

None of the above

Discuss
Answer: (a).optimize-for-fast-code switch Explanation:It is most likely that Cryptex was compiled using some kind of an optimize-for-fast-code switch, rather than with an optimize-for-small-code switch, because using the direct arithmetic instructions for division and multiplication would have produced smaller, yet slower, code.
Q69.
What is the purpose of the x command in Cryptex?

a.

To encrypt files

b.

To decrypt and extract files from encrypted archive files

c.

To compress files

d.

To delete files

Discuss
Answer: (b).To decrypt and extract files from encrypted archive files Explanation:The x command in Cryptex is used to decrypt and extract files from encrypted archive files.
Q70.
Why is it important to reverse the extraction process in Cryptex?

a.

To encrypt files more efficiently

b.

To decrypt files without extracting them

c.

To gain a clearer view of the file list data layout and how files are stored within archive files

d.

To speed up the extraction process

Discuss
Answer: (c).To gain a clearer view of the file list data layout and how files are stored within archive files Explanation:Reversing the extraction process in Cryptex provides a clearer view of the file list data layout and how files are stored within archive files.
Page 7 of 9

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