Certified Ethical Hacker Cryptography Fundamentals 4

Question 1

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

Accepted Answer

RSA

Answer

AES

Answer

RC4

Answer

DES

Question 2

What is steganography?

Accepted Answer

Hiding data within other non-secret files

Answer

Encrypting data with a public key

Answer

Hashing passwords

Answer

Exchanging keys securely

Question 3

What does HMAC provide that a simple hash does not?

Accepted Answer

Message authentication using a secret key

Answer

Faster hashing

Answer

Reversible encryption

Answer

Key generation

Question 4

Which protocol secures HTTP traffic by encrypting the connection?

Accepted Answer

TLS

Answer

FTP

Answer

SMTP

Answer

Telnet

Question 5

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

Accepted Answer

Replay attack

Answer

Birthday attack

Answer

Side-channel attack

Answer

Collision attack

Question 6

What is the main weakness of the original DES algorithm?

Accepted Answer

Its 56-bit key is too short

Answer

It uses asymmetric keys

Answer

It cannot encrypt text

Answer

It has no IV support

Question 7

Which cryptographic concept ensures a sender cannot deny having sent a message?

Accepted Answer

Non-repudiation

Answer

Confidentiality

Answer

Availability

Answer

Obfuscation