An attacker is attempting to recover a 128-bit AES key by trying all possible keys. The attacker has access to a large botnet. Which countermeasure would be most effective in preventing this attack from succeeding?

Use a longer key, such as AES-256.

Use a shorter key to reduce the attack surface.

Use a different block cipher mode, such as CBC instead of ECB.

Add a salt to the encryption process.

A company needs to ensure that a contract sent to a client is authentic and that the client can prove the company sent it. Which solution should be implemented?

Sign the contract with the company's private key and send the signature along with the contract.

Hash the contract and include the hash in the email.

Encrypt the contract with the client's public key.

Send the contract over a VPN connection.

What is the primary purpose of a digital signature?

To verify the identity of the sender and ensure the message was not altered

To encrypt the entire message for confidentiality

To create a shared secret key for symmetric encryption

To compress the message for efficient transmission

EC-CouncilCertified Cybersecurity Technician

Domain 5Objective 1

Cryptography CCT Practice Questions (Page 5)

Part of the Cryptography and Data Security domain, which makes up ~9% of our current practice bank.

45questions here

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Questions 21–25

21expert · hard
An attacker is attempting to recover a 128-bit AES key by trying all possible keys. The attacker has access to a large botnet. Which countermeasure would be most effective in preventing this attack from succeeding?
Select an answer first
22foundation · easy
Which cryptographic attack involves an attacker intercepting and potentially altering communications between two parties without their knowledge?
Select an answer first
23application · medium
A company needs to ensure that a contract sent to a client is authentic and that the client can prove the company sent it. Which solution should be implemented?
Select an answer first
24foundation · easy
What is the primary purpose of a digital signature?
Select an answer first
25application · easy
A security analyst notices that an attacker is capturing encrypted traffic between a client and a server and is attempting to guess the session key by trying all possible key values. Which type of cryptographic attack is this?
Select an answer first

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Cryptography CCT Practice Questions (Page 5)

Questions 21–25

An attacker is attempting to recover a 128-bit AES key by trying all possible keys. The attacker has access to a large botnet. Which countermeasure would be most effective in preventing this attack from succeeding?

Which cryptographic attack involves an attacker intercepting and potentially altering communications between two parties without their knowledge?

A company needs to ensure that a contract sent to a client is authentic and that the client can prove the company sent it. Which solution should be implemented?

What is the primary purpose of a digital signature?

A security analyst notices that an attacker is capturing encrypted traffic between a client and a server and is attempting to guess the session key by trying all possible key values. Which type of cryptographic attack is this?

Keep studying — Cryptography and Data Security