A portion of the Polymorphic virus, generally called a …………………….. , creates, a random encryption, key to encrypt the remainder of the virus.
Answer: D
Correct answer: mutation engine
The part of a polymorphic virus that generates the random key and rewrites the encrypted body is called the mutation engine. The other three names are not used.
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The type(s) of auto executing macros, in Microsoft word is/are
Answer: D
Correct answer: All of the above
Word supports all three kinds: command macros that replace a built-in command and run when it is invoked, auto macros that run on events such as opening or closing a document, and the AutoExec macro that runs when Word itself starts. Each gives a macro virus a way to execute without the user choosing to run anything.
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The altering of data so that it is not usable unless the changes are undone is
Answer: B
Correct answer: encryption
Encryption transforms data by a reversible algorithm so that it is unreadable without the key, and readable again once the transformation is undone. Compression also alters data reversibly but its purpose is to reduce size, not to conceal; biometrics identifies people and ergonomics concerns workplace design.
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Select the correct order for the different phases of virus execution. i) Propagation phase ii) Dormant phase iii) Execution phase iv) Triggering phase
Answer: A
Correct answer: ii, i, iv and iii
A virus passes through four phases in order: it lies dormant after infection, then propagates copies of itself into other programs, then is triggered by some event, and only then executes its payload. Spreading before acting is what makes a virus dangerous, so propagation must precede execution.
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Which of the following is known as Malicious software?
Answer: D
Correct answer: malware
Malware is the contraction of malicious software, and it covers viruses, worms, trojans, spyware and ransomware alike. The other three words are not terms in use.
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Message confidentiality or privacy means that sender and receiver expect
Answer: B
Correct answer: Confidentiality
Confidentiality, or privacy, is exactly the expectation that nobody but the intended receiver can read the message. Integrity, authentication and nonrepudiation are the other three services and answer different questions.
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A sender must not be able to deny sending a message that was sent, is known as
Answer: A
Correct answer: Message Nonrepudiation
Nonrepudiation means the sender cannot later deny having sent the message. A digital signature provides it, because only the sender's private key could have produced the signature.
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MAC stands for
Answer: A
Correct answer: Message authentication code
A MAC is a hash computed with a secret key, so it proves both that the message is unaltered and that it came from someone holding the key - integrity and authentication together.
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A -------- is a computer program that can replicate itself and spread from one computer to another.
Answer: B
Correct answer: Computer Virus
Self-replication is the defining property of a virus: it copies itself into other programs, and those copies spread when the host programs are run or shared. A pen drive can carry a virus but does not replicate anything itself.
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What is the best way to protect your information when you are away from your computer?
Answer: A
Correct answer: Lock the computer with a password
Locking the session requires the password to be re-entered before anything can be reached, so it protects the data. A screen saver only hides the screen and turning off the monitor only darkens it - in both cases everything remains open to anyone who touches the keyboard.
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