Chapter 21.2 Cryptography

Which encryption algorithm is considered a legacy algorithm and should be avoided?

• AES

• DES

• RSA

• 3DES

What is the main difference between asymmetric and symmetric encryption?

• The type of data they encrypt

• The way they use keys

• The speed of encryption

• The level of security

What are the two types of cipher modes in symmetric encryption?

• Block cipher and stream cipher

• Public cipher and private cipher

• Open cipher and closed cipher

• Fast cipher and slow cipher

Which encryption algorithm is based on the premise that each communicating party knows the pre-shared key?

• Asymmetric encryption

• Symmetric encryption

• Public key infrastructure

• Digital signature

What infrastructure is associated with asymmetric encryption?

• Public key infrastructure (PKI)

• Private key infrastructure (PKI)

• Digital infrastructure (DI)

• Secure infrastructure (SI)

What should be used to ensure more secure communications in symmetric encryption?

• A shorter key

• A longer key

• A public key

• A digital signature

Which encryption algorithm offers combinations of 128-, 192-, or 256-bit keys?

• DES

• 3DES

• AES

• SEAL

What is a major vulnerability of RC4?

• It is too fast

• It is insecure for web traffic

• It uses a long key length

• It is too complex

Which protocol is a fundamental component of IPsec VPNs?

• Secure Socket Layer (SSL)

• Internet Key Exchange (IKE)

• Secure Shell (SSH)

• Pretty Good Privacy (PGP)

Why are asymmetric algorithms slower than symmetric algorithms?

• They use longer keys

• They require more computational power

• They use more complex protocols

• They involve more parties