Symmetric Algorithms

Question 1

What is Triple DES (3DES)?

Answer 1

Symmetric Algorithm

It’s DES but uses three different 56 bit keys

1st key is the input data going into the DES algorithm
2nd key will attempt to decrypt using the same algorithm
3rd will put it through the DES algorithm one more time

Question 1

What is DES (Data Encryption Standard)?

Answer 1

Symmetric Algorithm

Encryption algorithm that has a key bit of 56 bits

Question 2

What is the International Data Encryption Algorithm (IDEA)?

Answer 2

Symmetric block cypher

uses 64 bit blocks to encrypt plaintext into ciphertext

Key size is 128 bits

Question 3

What is AES (Advanced Encryption Standard)?

Answer 3

Symmetric block cipher that uses 128-bit, 192-bit or 256-bit blocks and a matching encryption key size to encrypt plain text into ciphertext

Question 4

What is Blowfish?

Answer 4

Symmetric block cipher that uses 64-bit blocks and a variable length encryption key to encrypt plaintext to ciphertext

Question 5

What is TwoFish?

Answer 5

Provides the ability to use 128-bit blocks in its encryption algorithm 128-bit, 192-bit, or 256-bit encryption keys

Question 6

What is RC4 (Rivest Cipher)?

Answer 6

Symmetric stream cipher using a variable key size from 40-bits to 2048-bits that is used in SSL and WEP

Question 7

What is RC5?

Answer 7

Symmetric block cipher that uses key sizes up to 2048-bits

Question 8

What is RC6?

Answer 8

Symmetric block cipher that was introduced as a replacement for DES but AES was chosen instead