CCP Cryptography & Information Security

Question 1

Which type of encryption uses the same key for both encryption and decryption?

Accepted Answer

Symmetric encryption

Answer

Asymmetric encryption

Answer

Public-key encryption

Answer

Hybrid encryption

Question 2

What is the key length used by AES-256?

Accepted Answer

256 bits

Answer

128 bits

Answer

192 bits

Answer

512 bits

Question 3

Which property of a cryptographic hash function ensures that two different inputs cannot produce the same hash output?

Accepted Answer

Collision resistance

Answer

Preimage resistance

Answer

Avalanche effect

Answer

Key diffusion

Question 4

What distinguishes a hash function from encryption?

Accepted Answer

Hashing is a one-way function with no decryption key

Answer

Hashing is faster than encryption

Answer

Hashing uses larger keys than encryption

Answer

Hashing requires two parties to share a key

Question 5

What cryptographic concept ensures that a sender cannot later deny having sent a message?

Accepted Answer

Non-repudiation

Answer

Confidentiality

Answer

Integrity

Answer

Availability

Question 6

Which cipher is theoretically unbreakable when used correctly because its key is as long as the message and used only once?

Accepted Answer

One-time pad

Answer

Vigenère cipher

Answer

Caesar cipher

Answer

Blowfish cipher

Question 7

What is steganography in the context of information security?

Accepted Answer

Hiding data within other non-secret data to conceal its existence

Answer

Encrypting data using a symmetric algorithm

Answer

Converting data into an unreadable format using keys

Answer

Compressing data to reduce transmission overhead