Computer Security Questions and Answers

Q: The difference between a virus and a self-replicating program which is like a virus is that rather than creating copies of itself on only one system it propagate through computer network. What is th

Correct answer: WormThe distinguishing property is independence: a worm propagates itself across a network without needing a host program or any action by a user, whereas a virus can only spread when the program it has infected is run.

Q: A hash function guarantees integrity of a message. It guarantees that message has not be

Correct answer: ChangedA hash function gives integrity: any alteration to the message produces a different digest, so a matching digest shows the message has not been changed. It says nothing about who sent it or whether it was intercepted.

Q: In Message Integrity, SHA-l hash algorithms create an N-bit message digest out of a message of

Correct answer: 512 Bit BlocksSHA-1 pads the message and processes it in 512-bit blocks, updating a running state, and emits a 160-bit digest at the end. The block size and the digest size are different numbers and are often confused.

Q: To preserve integrity of a document, both document and fingerprint are

Correct answer: NeededThe check consists of comparing the fingerprint sent with the fingerprint computed from the document received, so both are required. Either one alone proves nothing.

Q: Why might someone break into (hack) your computer?

Correct answer: All of the aboveAll three are real motives, and the list runs from the petty to the criminal: spite, direct theft or fraud, and the use of the machine itself as a resource for distributing illegal material or attacking others. The last is the commonest and the one victims least expect, since it does no visible harm to them.

91.

The difference between a virus and a self-replicating program which is like a virus is that rather than creating copies of itself on only one system it propagate through computer network. What is th

A.Time Bomb
B.Cracker
C.Keylogger
D.Worm

Answer: D

Correct answer: Worm

The distinguishing property is independence: a worm propagates itself across a network without needing a host program or any action by a user, whereas a virus can only spread when the program it has infected is run.

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92.

A hash function guarantees integrity of a message. It guarantees that message has not be

A.Replaced
B.Over view
C.Changed
D.Violated

Answer: C

Correct answer: Changed

A hash function gives integrity: any alteration to the message produces a different digest, so a matching digest shows the message has not been changed. It says nothing about who sent it or whether it was intercepted.

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93.

In Message Integrity, SHA-l hash algorithms create an N-bit message digest out of a message of

A.512 Bit Blocks
B.1001 Bit Blocks
C.1510 Bit Blocks
D.2020 Bit Blocks

Answer: A

Correct answer: 512 Bit Blocks

SHA-1 pads the message and processes it in 512-bit blocks, updating a running state, and emits a 160-bit digest at the end. The block size and the digest size are different numbers and are often confused.

Discuss in Forum

94.

To preserve integrity of a document, both document and fingerprint are

A.Not Used
B.Unimportant
C.Needed
D.Not needed

Answer: C

Correct answer: Needed

The check consists of comparing the fingerprint sent with the fingerprint computed from the document received, so both are required. Either one alone proves nothing.

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95.

Why might someone break into (hack) your computer?

A.They don't like you
B.To commit a crime
C.To use it to distribute porn, malcious programs, etc.
D.All of the above

Answer: D

Correct answer: All of the above

All three are real motives, and the list runs from the petty to the criminal: spite, direct theft or fraud, and the use of the machine itself as a resource for distributing illegal material or attacking others. The last is the commonest and the one victims least expect, since it does no visible harm to them.

Discuss in Forum

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