Cryptography

Which of the following best describes cryptography?

• The process of storing data in multiple places for security

• A technique for speeding up data transfer rates

• A method for generating random numbers

• The science of transforming information to prevent unauthorized access

The Data Encryption Standard (DES) operates on which of the following block sizes?

• 32 bits

• 64 bits

• 128 bits

• 256 bits

The Advanced Encryption Standard (AES) uses which of the following key sizes?

• 92, 224, and 256 bits

• 64, 96, and 128 bits

• 128, 192, and 256 bits

• 56, 64, and 128 bits

In RSA encryption, what are the two main keys involved in the process?

• Symmetric and asymmetric keys

• Public key and private key

• Shared key and session key

• Private key and secret key

Which type of firewall filters traffic based on IP addresses and ports?

• Packet-filtering firewall

• Proxy firewall

• ext-generation firewall

• Stateful inspection firewall

Which of the following statements is true about symmetric-key cryptography?

• It is primarily used for digital signatures.

• It is slower than public-key cryptography for large datasets.

• It requires a public and private key pair.

• It is generally faster than public-key cryptography.

How many rounds of encryption does the DES algorithm use?

• 8

• 16

• 12

• 10

AES encryption follows which cryptographic structure?

• Feistel Network

• Substitution-Permutation Network (SPN)

• Linear Feedback Shift Register

• Block Chaining

In RSA, what is the primary purpose of choosing two large prime numbers?

• To create a private key

• To generate a symmetric key.

• To calculate the modulus used for encryption and decryption

• To improve data transfer speed

The main purpose of a firewall in a network is to:

• Monitor internet speeds

• Monitor internet speeds

• Optimize data encryption

• Prevent unauthorized access to or from a private network.