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Cryptographic Hash Functions

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Cryptographic hash functions are mathematical algorithms that transform any input data into a fixed-size output, known as a hash value, or simply 'hash'. These functions are designed to be deterministic, meaning the same input will always produce the same output. It should also be computationally i…

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CompTIA Security+ - Cryptographic Hash Functions Example Questions

Test your knowledge of Cryptographic Hash Functions

Question 1

Susan needs to upload a sensitive document to a secure cloud storage service. The service provider requires her to verify the document's integrity by providing a hash value. Which of the following hash functions should she use to ensure the most security?

Correct Answer: SHA-3

SHA-3 (Secure Hash Algorithm 3) is recommended for generating hash values for sensitive documents as it is highly secure and resistant to collision attacks. MD4, MD5, and SHA-1 are considered weaker due to known vulnerabilities while SHA-224 is less secure compared to SHA-3. HMAC is not a hash function but a keyed-hash message authentication code.

Question 2

Your company is developing a new secure messaging application. The application needs to implement a hashing algorithm that is resistant to pre-image, second pre-image, and collision attacks. Which hashing algorithm is the most suitable for this purpose?

Correct Answer: BLAKE2

BLAKE2 is a modern cryptographic hash function that is resistant to pre-image, second pre-image, and collision attacks, making it suitable for secure messaging applications. MD5 and SHA-1 are known to have vulnerabilities, while RIPEMD, CRC32, and WHIRLPOOL are not as secure as BLAKE2.

Question 3

You are a network administrator and you suspect that an unauthorized user has altered a file on your server. You want to verify the integrity of the file. Which of the following Cryptographic Hash Functions would be best suited for this?

Correct Answer: SHA-256

SHA-256 is a cryptographic hash function that is used for verifying the integrity of files and ensuring data has not been tampered with. DES, AES-128, 3DES, and RC4 are encryption algorithms used for encrypting and decrypting data, while RSA is an asymmetric encryption algorithm used for secure communication.

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