Cyber Security Cryptography 3

Question 1

What is the purpose of a Certificate Revocation List (CRL)?

Accepted Answer

Identify certificates that have been revoked before expiry

Answer

List all active certificates

Answer

Store private keys securely

Answer

Rank certificates by trust level

Question 2

Which elliptic curve algorithm is commonly used for key agreement in modern TLS implementations?

Accepted Answer

ECDH (Elliptic Curve Diffie-Hellman)

Answer

RSA-2048

Answer

3DES

Answer

HMAC-SHA1

Question 3

What is steganography?

Accepted Answer

Hiding secret data within non-secret files or media

Answer

Encrypting data with a one-time pad

Answer

Compressing data to reduce file size

Answer

Signing messages with a hash function

Question 4

What does HMAC (Hash-based Message Authentication Code) provide?

Accepted Answer

Both message integrity and authenticity using a shared secret key

Answer

Key generation for asymmetric algorithms

Answer

Certificate signing for PKI

Answer

Entropy for random number generation

Question 5

Which property of a cryptographic hash function ensures it is computationally infeasible to find the original input from its hash?

Accepted Answer

Preimage resistance

Answer

Collision resistance

Answer

Avalanche effect

Answer

Determinism

Question 6

What is a rainbow table attack used to crack?

Accepted Answer

Hashed passwords by looking up precomputed hash-to-plaintext mappings

Answer

Encrypted disk images

Answer

TLS session keys

Answer

RSA private keys