What kind of attempts is made by individuals to obtain confidential information from a person by falsifying their identity?
Answer: A
Correct answer: Phishing scams
Phishing is impersonation used to extract information: the attacker pretends to be a bank or a colleague and asks for the credentials directly. Spyware takes information without asking, which is a different method.
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When does the time bomb occur?
Answer: C
Correct answer: During a particular date or time
A time bomb is a logic bomb whose trigger is the clock or the calendar, so it fires on a chosen date or at a chosen time - the Friday the 13th and Michelangelo viruses are the classic examples. A trigger on some other condition makes it a logic bomb rather than a time bomb.
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Delayed payload of some viruses is also called as
Answer: A
Correct answer: Bomb
A payload that waits for a condition before acting is called a bomb - a time bomb when the trigger is a date, a logic bomb when it is some other event. The delay is what the name refers to.
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What is the first boot sector virus?
Answer: B
Correct answer: Brain
Brain, written in Pakistan in 1986, was the first boot sector virus for the PC: it replaced the boot sector of a floppy disk and spread whenever an infected disk was used to start a machine. Elk Cloner, from 1982, was earlier but infected the Apple II.
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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
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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What is anti-virus?
Answer: A
Correct answer: It is a program code
Antivirus is software - a program that scans files and memory against a database of known threats. The names of the products are company names, but the thing itself is code.
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Confidentiality with asymmetric-key cryptosystem has its own
Answer: C
Correct answer: Problems
Asymmetric-key cryptography solves the key distribution problem but brings difficulties of its own: it is far slower than symmetric encryption, so it is impractical for bulk data, and it needs a trusted way of certifying that a public key really belongs to its claimed owner. In practice it is used to exchange a symmetric session key rather than to encrypt the message itself.
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SHA-l has a message digest of
Answer: A
Correct answer: 160 bits
SHA-1 produces a 160-bit digest, whatever the length of the message. The 512 bits in the other option is the size of the block it processes at a time, not of the digest.
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Message authentication is a service beyond
Answer: B
Correct answer: Message Integrity
Integrity says the message has not been altered; authentication goes further and says who sent it. A message could be unaltered and still come from an impostor, which is why authentication is the stronger service.
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In Message Confidentiality, transmitted message must make sense to only intended
Answer: A
Correct answer: Receiver
Confidentiality means the content is intelligible only to the party it is addressed to. Anyone else who intercepts it should obtain nothing but ciphertext.
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