Deck 16: Security

Question 1

In __________cryptography, the same key is used by the sender and the receiver.

A) symmetric-key
B) asymmetric-key
C) public-key
D) open-key

Answer 1

A

Question 2

___________ means that the data must arrive at the receiver exactly as they were sent.

A) Nonrepudiation
B) Message integrity
C) Authentication
D) Secrecy

Answer 2

B

Question 3

_________ cryptography is often used for long messages.

A) Symmetric-key
B) Asymmetric-key
C) Public-key
D) Open-key

Answer 3

A

Question 4

In the asymmetric-key method used for confidentiality, which key(s) is (are) publicly known?

A) encryption key only
B) decryption key only
C) both encryption and decryption keys
D) neither encryption key nor decryption key

Question 5

In RSA, if user A wants to send an encrypted message to user B, the plaintext is encrypted with the public key of _______.

A) user A
B) user B
C) the network
D) a third party.

Question 6

The RSA algorithm for confidentiality uses _______ cryptography.

A) asymmetric-key
B) symmetric-key
C) substitution
D) transposition

Question 7

__________means that the sender and the receiver expect confidentiality.

A) Nonrepudiation
B) Integrity
C) Authentication
D) encryption and decryption

Question 8

In _________ cryptography, the same key is used in both directions.

A) symmetric-key
B) asymmetric-key
C) public-key
D) open-key

Question 9

Which of the following attacks is threatening availability?

A) Replaying
B) Modification
C) Denial of service
D) Decoding

Question 10

In __________ cryptography, everyone has access to everyone's public key.

A) symmetric-key
B) asymmetric-key
C) secret-key
D) private-key

Question 11

In ___________, the identity of a party is verified once for the entire duration of system access.

A) entity authentication
B) message integrity
C) message authentication
D) message encryption

Question 12

Which of the following attacks is threatening integrity?

A) Masquerading
B) Traffic Analysis
C) Denial of service
D) Encoding

Question 13

_____________ means concealing the contents of a message by enciphering.

A) Steganography
B) Cryptography
C) Compressing
D) Authentication

Question 14

______________means concealing the message by covering it with something else.

A) Cryptography
B) Steganography
C) Compressing
D) Authentication

Question 15

___________ cryptography is often used for short messages.

A) Symmetric-key
B) Asymmetric-key
C) Secret-key
D) Open-key

Question 16

Three security goals are _____.

A) confidentiality, cryptography, and nonrepudiation
B) confidentiality, encryption, and decryption
C) confidentiality, integrity, and availability
D) confidentiality, denial of service, and masquerading

Question 17

______________ can provide authentication, integrity, and nonrepudiation for a message.

A) Encryption/decryption
B) Digital signature
C) Compression
D) Key-exchange