Certified Ethical Hacker Cryptography Fundamentals 5

Question 1

Which attack exploits the mathematics of the birthday paradox to find hash collisions?

Accepted Answer

Birthday attack

Answer

Brute-force attack

Answer

Dictionary attack

Answer

Phishing attack

Question 2

What type of attack extracts keys by measuring power consumption or timing of a device?

Accepted Answer

Side-channel attack

Answer

Replay attack

Answer

Man-in-the-middle attack

Answer

Collision attack

Question 3

Which key-stretching algorithm is designed specifically to slow down password cracking?

Accepted Answer

bcrypt

Answer

MD5

Answer

RC4

Answer

Base64

Question 4

In a man-in-the-middle attack on key exchange, what does the attacker do?

Accepted Answer

Intercepts and relays communication while impersonating both parties

Answer

Cracks the hash function

Answer

Floods the server with traffic

Answer

Encodes data in images

Question 5

What is perfect forward secrecy (PFS)?

Accepted Answer

Compromise of a long-term key does not expose past session keys

Answer

Reusing one key forever

Answer

Using only symmetric encryption

Answer

Storing keys in plaintext

Question 6

Which technology is expected to threaten RSA and ECC by efficiently factoring large numbers?

Accepted Answer

Quantum computing

Answer

Blockchain

Answer

Cloud computing

Answer

Edge computing

Question 7

What is the purpose of a nonce in cryptographic protocols?

Accepted Answer

A number used once to prevent replay attacks

Answer

To permanently store keys

Answer

To compress ciphertext

Answer

To replace the public key