Certified Ethical Hacker Cryptography Fundamentals 4

Question 1

Which algorithm is an example of asymmetric (public-key) cryptography?

Accepted Answer

RSA

Answer

RSA is a widely used asymmetric algorithm based on factoring large prime numbers.

Question 2

What is steganography?

Accepted Answer

Hiding data within other non-secret files

Answer

Steganography conceals the existence of a message by embedding it in other media.

Question 3

What does HMAC provide that a simple hash does not?

Accepted Answer

Message authentication using a secret key

Answer

HMAC combines a hash with a secret key to verify both integrity and authenticity.

Question 4

Which protocol secures HTTP traffic by encrypting the connection?

Accepted Answer

TLS

Answer

TLS encrypts the communication channel, enabling HTTPS.

Question 5

An attacker captures and retransmits a valid encrypted authentication token. What attack is this?

Accepted Answer

Replay attack

Answer

A replay attack reuses captured valid data to gain unauthorized access.

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