Network Communication Authentication Worksheet

Which of the following is NOT a type of attack identified in the context of network communication authentication?

• Disclosure

• Traffic analysis

• Content modification

• Data compression

In a connection-oriented application, what aspect of traffic can be determined through traffic analysis?

• The content of the messages

• The frequency and duration of connections

• The secret key used for encryption

• The source IP address

What is the primary function of a Message Authentication Code (MAC)?

• To encrypt the entire message

• To provide confidentiality

• To produce an authenticator

• To modify the content of a message

What is the main difference between a MAC and a hash function?

• MAC uses a key, while a hash function does not

• Hash function uses a key, while a MAC does not

• MAC is a public function, while a hash function is secret

• They both use keys and are secret functions

Which of the following is provided by symmetric encryption?

• Authentication and confidentiality

• Confidentiality only

• Authentication only

• Digital signature

What is the main problem with using public-key encryption for authentication?

• It is too slow

• It only provides confidentiality

• Anyone can use the receiver's public key to send a message

• It requires a complex algorithm

What does public-key encryption provide when the message is encrypted with the sender's private key?

• Confidentiality

• Authentication or Digital Signature

• Both confidentiality and authentication

• Neither authentication nor confidentiality

What is the main problem with using public key encryption for authentication and signature?

• The receiver cannot determine whether the packet decrypted contains some useful message or random bits.

• The algorithm is too simple.

What is the purpose of appending an error-detecting code (FCS or checksum) to a message before encryption?

• To increase the message size

• To provide confidentiality

• To detect changes to the message

• To speed up the encryption process

In the context of MAC, what is the purpose of the shared secret key?

• To encrypt the message

• To generate the MAC

• To decrypt the message

• To provide confidentiality