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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 8 of 9

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Q71.
What is the purpose of the hash object created in the Cryptex file extraction routine?

a.

To encrypt the file data

b.

To calculate the password hash

c.

To verify the file list

d.

The purpose is still unclear

Discuss
Answer: (d).The purpose is still unclear Explanation:The purpose of the hash object created in the Cryptex file extraction routine is still unclear.
Q72.
What type of algorithm is used to create the hash object in the Cryptex file extraction routine?

a.

ALG_SID_MD5

b.

ALG_SID_SHA1

c.

ALG_SID_SHA256

d.

ALG_SID_AES256

Discuss
Answer: (a).ALG_SID_MD5 Explanation:The algorithm type used to create the hash object in the Cryptex file extraction routine is ALG_SID_MD5.
Q73.
What is the purpose of the "x command" in Cryptex?

a.

To create an encrypted archive file

b.

To decrypt and extract files from an encrypted archive file

c.

To encrypt individual files

d.

To verify password for an archive file

Discuss
Answer: (b).To decrypt and extract files from an encrypted archive file Explanation:The x command in Cryptex is used to decrypt and extract files from its encrypted archive files.
Q74.
What is the purpose of the MD5 checksum in the Cryptex header?

a.

To confirm the user-supplied password

b.

To encrypt the data in the archive

c.

To verify the integrity of the archive

d.

To compress the data in the archive

Discuss
Answer: (c).To verify the integrity of the archive Explanation:The 16-byte MD5 checksum in the Cryptex header is used to verify the integrity of the archive.
Q75.
How is the triple-DES key generated in Cryptex?

a.

By hashing the user-supplied password using the SHA algorithm and treating the resulting 160-bit hash as the key

b.

By encrypting the user-supplied password using the MD5 algorithm

c.

By using the user-supplied password as the key directly

d.

By randomly generating a key for each archive

Discuss
Answer: (a).By hashing the user-supplied password using the SHA algorithm and treating the resulting 160-bit hash as the key Explanation:The triple-DES key in Cryptex is generated by hashing the user-supplied password using the SHA algorithm and treating the resulting 160-bit hash as the key.
Q76.
What algorithm does Cryptex use to encrypt its archives?

a.

AES

b.

RSA

c.

SHA

d.

triple-DES

Discuss
Answer: (d).triple-DES Explanation:Cryptex uses the Crypto-API implementation of the triple-DES algorithm to encrypt its archives.
Q77.
What is the purpose of the 8-byte signature in the Cryptex header?

a.

To encrypt the archive

b.

To confirm the user-supplied password

c.

To verify the integrity of the archive

d.

To identify the archive format

Discuss
Answer: (d).To identify the archive format Explanation:The 8-byte signature in the Cryptex header is used to identify the archive format. In Cryptex's case, the signature contains the string CrYpTeX9.
Q78.
What is the purpose of the 16-byte MD5 hash that ends up in the Cryptex header?

a.

To confirm the user-supplied password

b.

To encrypt the data in the archive

c.

To verify the integrity of the archive

d.

To compress the data in the archive

Discuss
Answer: (a).To confirm the user-supplied password Explanation:The 16-byte MD5 hash that ends up in the Cryptex header is used to confirm the user-supplied password matches the one used when the archive was created.
Q79.
What algorithm is used to encrypt all clusters in Cryptex archives?

a.

SHA

b.

MD5

c.

Triple-DES

d.

AES

Discuss
Answer: (c).Triple-DES Explanation:All clusters in Cryptex archives are encrypted using the Triple-DES algorithm.
Q80.
What is the maximum length of file names in Cryptex archives?

a.

256 bytes

b.

512 bytes

c.

128 bytes

d.

64 bytes

Discuss
Answer: (c).128 bytes Explanation:The maximum length of file names in Cryptex archives is 128 bytes.
Page 8 of 9

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