A development team is building an IoT device that must encrypt sensor readings before transmission. The device has very limited CPU and battery resources. The team needs an encryption algorithm that provides strong security with minimal computational overhead. Which algorithm is the best choice?

Blowfish with a 64-bit block size

RSA-2048 for all data encryption

AES-256 in hardware-accelerated mode

What is the main advantage of a hybrid encryption system over using only asymmetric encryption?

It uses only one key for all operations.

It provides stronger encryption than asymmetric alone.

It eliminates the need for key management.

It combines the security of asymmetric key exchange with the speed of symmetric encryption.

A startup is building a mobile payment app that requires secure key exchange with a server. The app must minimize battery usage and data transfer. Which asymmetric algorithm is most suitable for this scenario?

Diffie-Hellman with a 1024-bit key

What is the primary characteristic of the key in symmetric encryption?

It is publicly known and used for verification.

It is a single secret key shared between communicating parties.

It is generated fresh for each message and never reused.

It is a pair of mathematically related keys.

A multinational company needs to encrypt data shared between its headquarters and branch offices. The data is large (terabytes) and must be encrypted in transit. The company wants to minimize the risk of key compromise and ensure that keys are rotated regularly. Which approach best satisfies these requirements?

Use a VPN with TLS, which uses hybrid encryption and supports automatic key rotation.

Use RSA-2048 to encrypt all data in transit.

Use a symmetric key exchange via email and change it monthly.

Use a static AES-256 key shared between all offices and rotate it manually every year.

EC-CouncilCertified Ethical Hacker

Domain 9Objective 1

Encryption Algorithms (Symmetric/Asymmetric) CEH Practice Questions (Page 4)

Part of the Cryptography domain, which makes up ~9% of our current practice bank. EC-Council does not publish an official question count, but from its 240-minute exam (~95–160 total, ~9–14 in this domain), expect 2–4 from this objective — we provide 41 practice questions to prepare you well beyond it. (estimate)

41questions here

9free pages

8concepts

Questions 16–20

16application · medium
A development team is building an IoT device that must encrypt sensor readings before transmission. The device has very limited CPU and battery resources. The team needs an encryption algorithm that provides strong security with minimal computational overhead. Which algorithm is the best choice?
Select an answer first
17foundation · easy
What is the main advantage of a hybrid encryption system over using only asymmetric encryption?
Select an answer first
18application · medium
A startup is building a mobile payment app that requires secure key exchange with a server. The app must minimize battery usage and data transfer. Which asymmetric algorithm is most suitable for this scenario?
Select an answer first
19foundation · easy
What is the primary characteristic of the key in symmetric encryption?
Select an answer first
20expert · hard
A multinational company needs to encrypt data shared between its headquarters and branch offices. The data is large (terabytes) and must be encrypted in transit. The company wants to minimize the risk of key compromise and ensure that keys are rotated regularly. Which approach best satisfies these requirements?
Select an answer first

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