CNS_1

__________ involves the passive capture of a data unit and its subsequent retransmission to produce an unauthorized effect.

• Disruption

• Replay

• Service denial

• Masquerade

A common technique for masking contents of messages or other information traffic so that opponents can not extract the information from the message is____________

• integrity

• encryption

• analysis

• masquerade

A __________ takes place when one entity pretends to be a different entity

• replay

• masquerade

• passive attack

• service denial

__________ is the protection of transmitted data from passive attacks

• Access control

• Data control

• Nonrepudiation

• Confidentiality

The protection of the information that might be derived from observation of traffic flows is _________

• connectionless confidentiality

• connection confidentiality

• traffic- flow confidentiality

• selective- field confidentiality

A _________ level breach of security could cause a significant degradation in mission capability to an extent and duration that the organization is able to perform its primary functions, but the effectiveness of the functions is significantly reduced.

• catastrophic

• moderate

• low

• high

The methods of __________ conceal the existence of the message in a graphic

image.

• steganography

• decryptology

• cryptology

• cryptography

A way to improve on the simple monoalphabetic technique is to use different monoalphabetic substitutions as one proceeds through the plaintext message. The general name for this approach is ___________ .

• rail fence cipher

• cryptanalysis

• polyanalysis cipher

• polyalphabetic substitution cipher

If both sender and receiver use the same key, the system is referred to as ___________

• public-key encryption

• asymmetric

• two-key

• conventional encryption

A technique referred to as a __________ is a mapping achieved by performing some sort of permutation on the plaintext letters

• transposition cipher

• Caesar cipher

• polyalphabetic cipher

• monoalphabetic cipher