IT286M4 Cryptography

Steganography

What is the cryptographic mechanism that hides secret communications within various forms of data?

Codes

Signals

Polyinstantiation

Steganography

One-time pad

Which of the following encryption methods combines a random value with the plain text to produce the cipher text?

Steganography

Elliptic curve

One-time pad

Transposition

Transposition

Which type of cipher changes the position of the characters in a plain text message?

Steam

Block

Transposition

Substitution

Analytic attack

Which of the following is a form of mathematical attack against the complexity of a cryptosystem’s algorithm?

Birthday attack

Analytic attack

Replay attack

Brute force attack

Create a message digest.

Hashing algorithms are used to perform what activity?

Provide for non-repudiation.

Provide a means to exchange small amounts of data securely over a public network.

Encrypt bulk data for communications exchange.

Create a message digest.

Collision

When two different messages produce the same hash value, what has occurred?

Birthday attack

Collision

Hash value
High amplification

A worm can replicate itself, while a virus requires a host for distribution.

What is the main difference between a worm and a virus?

A worm requires an execution mechanism to start, while a virus can start itself.

A worm tries to gather information, while a virus tries to destroy data.

A worm is restricted to one system while a virus can spread from system to system.

A worm can replicate itself, while a virus requires a host for distribution.

Botnet

A collection of zombie computers has been setup to collect personal information. What type of malware do the zombie computers represent?

Botnet

Trojan horse

Logic bomb

Spyware

Trojan horse

What is a program that appears to be a legitimate application, utility, game, or screensaver and that performs malicious activities surreptitiously?

Outlook Express

Trojan Horse

Worm

ActiveX control

A program that performs a malicious activity at a specific time or after a triggered event.

Which of the following describes a logic bomb?

A program that performs a malicious activity at a specific time or after a triggered event.

A program that has no useful purpose, but attempts to spread itself to other systems and often damages resources on the systems where it is found.

A program that appears to be a legitimate application, utility, game, or screensaver which performs malicious activities surreptitiously.

A type of malicious code, similar to a virus, whose primary purpose is to duplicate itself and spread, while not necessarily intentionally damaging or destroying resources.