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 5 of 9

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Q41.

What does the use of the Windows Crypto API by Cryptex indicate?

It indicates that it uses built-in implementation of the encryption algorithm.

It indicates that it uses generic cryptographic library that provides support for installable cryptographic service providers (CSPs).

It indicates that it does not support a wide range of symmetric and asymmetric cryptographic algorithms such as DES, RSA, and AES.

It indicates that it is going to be quite difficult to determine which encryption algorithms the program employs and how it produces the encryption keys.

Discuss

Answer: (b).It indicates that it uses generic cryptographic library that provides support for installable cryptographic service providers (CSPs). Explanation:The use of the Windows Crypto API by Cryptex indicates that it uses a generic cryptographic library that provides support for installable cryptographic service providers (CSPs) and can be used for encrypting and decrypting data using a variety of cryptographic algorithms. Microsoft provides several CSPs that support a wide range of symmetric and asymmetric cryptographic algorithms such as DES, RSA, and AES.

Q42.

What library function does Cryptex use to print messages to the console window?

scanf

printf

strcpy

strlen

Discuss

Answer: (b).printf Explanation:The Cryptex uses the printf runtime library function to print messages to the console window.

Q43.

How can a memory breakpoint be set in OllyDbg?

By selecting Breakpoint ➪ Hardware, On write ➪ Dword

By selecting Breakpoint ➪ Software, On read/write access

By selecting Breakpoint ➪ Memory, On data access

None of the above

Discuss

Answer: (a).By selecting Breakpoint ➪ Hardware, On write ➪ Dword Explanation:A memory breakpoint can be set in OllyDbg by opening the address in the Dump window, right-clicking the address, and selecting Breakpoint ➪ Hardware, On write ➪ Dword.

Q44.

What is a hash, according to MSDN?

A fixed-sized result obtained by applying a mathematical function to an arbitrary amount of data

A variable-sized result obtained by applying a mathematical function to a fixed amount of data

A fixed-sized result obtained by applying a mathematical function to a fixed amount of data

None of the above

Discuss

Answer: (a).A fixed-sized result obtained by applying a mathematical function to an arbitrary amount of data Explanation:A hash is "A fixed-sized result obtained by applying a mathematical function (the hashing algorithm) to an arbitrary amount of data."

Q45.

What is the purpose of the CryptCreateHash function?

To initiate the hashing of a stream of data

To add data to a specified hash object

To retrieve data that governs the operations of a hash object

None of the above

Discuss

Answer: (a).To initiate the hashing of a stream of data Explanation:The purpose of the CryptCreateHash function is to initiate the hashing of a stream of data.

Q46.

What does MD stand for in MD5?

Message-Digest

Maximum Data

Message Data

Machine Data

Discuss

Answer: (a).Message-Digest Explanation:MD stands for Message-Digest in MD5.

Q47.

What is the purpose of the MD5 hashing algorithm?

To produce a long hash or checksum from a message

To compress a message into a smaller size

To encrypt a message

To decrypt a message

Discuss

Answer: (a).To produce a long hash or checksum from a message Explanation:The purpose of the MD5 hashing algorithm is to produce a long hash or checksum from a message.

Q48.

What are the two basic properties of MD5 and other cryptographic hashes?

It is extremely unlikely that there would ever be two different messages that produce the same hash and that it is virtually impossible to create a message that will generate a predetermined hash value.

It is extremely likely that there would ever be two different messages that produce the same hash and that it is virtually possible to create a message that will generate a predetermined hash value.

It is extremely unlikely that there would ever be two different messages that produce the same hash and that it is virtually possible to create a message that will generate a predetermined hash value.

It is extremely likely that there would ever be two different messages that produce the same hash and that it is virtually impossible to create a message that will generate a predetermined hash value.

Discuss

Answer: (a).It is extremely unlikely that there would ever be two different messages that produce the same hash and that it is virtually impossible to create a message that will generate a predetermined hash value. Explanation:The two basic properties of MD5 and other cryptographic hashes are that it is extremely unlikely that there would ever be two different messages that produce the same hash and that it is virtually impossible to create a message that will generate a predetermined hash value.

Q49.

What is Cryptex doing with the data it is hashing?

It is writing the result into a global variable

It is encrypting the data

It is compressing the data

It is comparing the data to a value stored in the Cryptex archive file

Discuss

Answer: (a).It is writing the result into a global variable Explanation:Cryptex is writing the result of the hash into a global variable.

Q50.

What does Cryptex do if the value in the global variable does not match the value stored in the Cryptex archive file?

It reports an incorrect password

It encrypts the password

It compresses the password

It does nothing

Discuss

Answer: (a).It reports an incorrect password Explanation:If the value in the global variable does not match the value stored in the Cryptex archive file, Cryptex reports an incorrect password.

Page 5 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 5 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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