Which of the following is a common use of a cryptographic hash function?

Encrypting data for confidentiality

Generating public/private key pairs

Which of the following is a characteristic of symmetric encryption?

It is slower than asymmetric encryption for the same security level

It uses the same key for both encryption and decryption

It is primarily used for digital signatures

It uses two different keys: one public and one private

Which of the following best describes the core goal of cryptography known as 'non-repudiation'?

Verifying that the sender of a message is who they claim to be

Providing proof that a specific party sent a message and cannot deny it later

Preventing unauthorized parties from reading the content of a message

Ensuring that data is not altered during transmission

A security team is evaluating the strength of their encryption system. They want to determine whether an attacker could feasibly recover a plaintext message by trying every possible key. The system uses a 128-bit symmetric key. Which attack is this, and what is the primary defense?

Brute-force attack; use a sufficiently large key space (e.g., 256-bit key).

Side-channel attack; use constant-time algorithms.

Man-in-the-middle attack; use certificate pinning.

Replay attack; use timestamps and nonces.

EC-CouncilEthical Hacking Essentials

Domain 1Objective 3

Cryptography Concepts EHE Practice Questions (Page 5)

Part of the Information Security and Ethical Hacking Foundations domain, which makes up ~16% of our current practice bank.

39questions here

8free pages

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Questions 21–25

21foundation · easy
Which of the following is a common use of a cryptographic hash function?
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22foundation · easy
Which of the following is a characteristic of symmetric encryption?
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23foundation · easy
Which of the following best describes the core goal of cryptography known as 'non-repudiation'?
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24expert · hard
A security team is evaluating the strength of their encryption system. They want to determine whether an attacker could feasibly recover a plaintext message by trying every possible key. The system uses a 128-bit symmetric key. Which attack is this, and what is the primary defense?
Select an answer first
25foundation · easy
Which property of a cryptographic hash function ensures that it is computationally infeasible to find two different inputs that produce the same hash output?
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