What is the name of the viruses that fool a user into downloading and/or executing them by pretending to be useful applications?
Answer: D
Correct answer: Trojan horses
A trojan is defined by its disguise: it presents itself as something useful so the user runs it willingly. A worm needs no such trick, since it propagates by itself, and a keylogger describes a payload rather than a method of getting in.
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Which among the following is an anti-virus program
Answer: D
Correct answer: All of these
Norton, K7 and Quick Heal are all antivirus products.
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Which of the following viruses takes over the computer system when it boots and destroys information?
Answer: A
Correct answer: Boot infectors
A boot sector virus writes itself into the boot record, so it is loaded before the operating system every time the machine starts and can destroy data from a position where nothing is yet in place to stop it. A stealth virus is defined by hiding from detection, which is a different property, and a trojan does not replicate at all.
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Which of the following is/are threats for electronic payment systems?
Answer: D
Correct answer: All of the above
Each of the three threatens an electronic payment system in its own way: a virus can corrupt transaction data, a worm can consume the bandwidth the system depends on, and a trojan can capture card details or credentials while pretending to be legitimate software.
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If you receive an email claiming to need your username and/or password, what should you do?
Answer: A
Correct answer: Report it as phishing/spam through your email provider
No legitimate service asks for a password by email, so such a message is phishing. Reporting it both protects the account and helps the provider block the sender for everyone else; merely deleting it does the first but not the second, and replying hands over exactly what the attacker asked for.
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You just got a new computer which has antivirus software already installed. Is it safe to use on the internet immediately?
Answer: A
Correct answer: No
Antivirus software that shipped with the machine is out of date the moment the machine is sold, since new threats appear daily and its definitions were fixed at the factory. It has to be updated - along with the operating system's patches - before the machine can safely be exposed to the internet.
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Authentication is
Answer: A
Correct answer: hard to assure identity of user on a remote system
Authentication is the problem of establishing that a user really is who the user claims to be, and it is genuinely hard across a network, where the system sees only the messages it is sent. Insertion and modification are kinds of attack on data rather than the process of establishing identity.
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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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To check integrity of a message, or document, receiver creates the
Answer: B
Correct answer: Finger Print
The receiver computes the hash of the document it has received - its fingerprint - and compares it with the fingerprint sent with the document. If the two agree, nothing has been altered.
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One way to preserve integrity of a document is through use of a
Answer: B
Correct answer: Finger Print
A hash of the document, called its fingerprint, is short, fixed in length, and changes completely if a single bit of the document changes - which is what makes it a check on integrity.
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