AC Quiz

What is the main purpose of cryptography?

• To create complex mathematical puzzles

• To secure data through encryption and decryption

• To develop faster computing algorithms

• To enhance internet speed

Which of the following best describes a cipher?

• A key used for encryption

• A mathematical function that generates a random number

• A system that transforms plaintext into ciphertext

• A protocol used in online banking

In the Vernam Cipher, what ensures it is theoretically unbreakable?

• Use of S-boxes for substitution

• The randomness of the key and its use only once

• Its reliance on complex algebraic functions

• The use of elliptic curve cryptography

Which of the following best describes symmetric encryption?

• Uses a pair of keys for encryption and decryption

• Uses the same key for both encryption and decryption

• Encrypts data using quantum principles

• Always requires an internet connection to function

What is a major disadvantage of symmetric encryption?

• It is too slow for practical use

• It requires secure key exchange between parties

• It cannot be used for real-time encryption

• It is less efficient than hashing algorithms

Which of the following is NOT an example of symmetric encryption?

• AES

• DES

• RSA

• SDES

Which of the following is an example of a stream cipher?

• AES

• DES

• RC4

• SDES

How does a block cipher process data?

• Encrypts one bit at a time

• Encrypts blocks of fixed size

• Uses a keystream generator for encryption

• Does not require a key for decryption

How many rounds does DES encryption perform?

• 2

• 10

• 16

• 32

DES encrypts data in blocks of:

• 32 bits

• 56 bits

• 64 bits

• 128 bits