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.

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?

To encrypt the file data

To calculate the password hash

To verify the file list

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?

ALG_SID_MD5

ALG_SID_SHA1

ALG_SID_SHA256

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?

To create an encrypted archive file

To decrypt and extract files from an encrypted archive file

To encrypt individual files

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?

To confirm the user-supplied password

To encrypt the data in the archive

To verify the integrity of the archive

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?

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

By encrypting the user-supplied password using the MD5 algorithm

By using the user-supplied password as the key directly

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?

AES

RSA

SHA

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?

To encrypt the archive

To confirm the user-supplied password

To verify the integrity of the archive

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?

To confirm the user-supplied password

To encrypt the data in the archive

To verify the integrity of the archive

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?

SHA

MD5

Triple-DES

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?

256 bytes

512 bytes

128 bytes

64 bytes

Discuss

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

Page 8 of 9

Low Level Software 🔒

Windows Fundamentals 🔒

Reversing Tools 🔒

Auditing Program Binaries 🔒

Reversing Malware 🔒

Antireversing Techniques 🔒

Breaking Protections 🔒

Reversing .NET 🔒

Deciphering Code Structures 🔒

Deciphering Program Data 🔒

Welcome to the Deciphering File Formats MCQs Page

Deciphering File Formats MCQs | Page 8 of 9

Explore more Topics under Reverse Engineering

Introduction to Reverse Engineering

Beyond the Documentation

Piracy and Copy Protection

Decompilation

Understanding Compiled Arithmetic

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