Symmetric Alogorithms

Question 1

Algorithms with a block size of 64 bits

Answer 1

• Blowfish
• Skipjack
• DES (very weak)
• 3DES (moderate)
• IDEA
• RC2

The following CAN have 64 bits (but also higher):
- RC5

Question 2

Algorithms with a block size of 128 bits

Answer 2

• AES (strong)
• Twofish
• RC5 (can also have 32 or 64) –> very strong

Question 3

Algorithms with “Streaming” and therefore no block size

Answer 3

RC4

Question 4

Well-known block ciphers

Answer 4

• AES (strong)
• DES (very weak)
• 3DES (moderate)

Question 5

Well-known RSA block mode cipher

Answer 5

RC5 (very strong)

Question 6

Well-known stream cipher

Answer 6

RC4

Question 7

Key size of AES

Answer 7

128, 192, 256 bits

Question 8

Key size of Blowfish

Answer 8

32-448 bits

Question 9

Key size of DES

Answer 9

56 bits

Question 10

Key size of 3DES

Answer 10

112 or 168 bits

Question 11

Key size of IDEA

Answer 11

128 bits

Question 12

Key size of RC2

Answer 12

128 bits

Question 13

Key size of RC4

Answer 13

128 bits

Question 14

Key size of RC5

Answer 14

0-2040 bits

Question 15

Key size of Skipjack

Answer 15

80 bits

Question 16

Key size of Twofish

Answer 16

1-256 bits