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.
Please log in or register to report this question.
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.
Please log in or register to report this question.
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.
Please log in or register to report this question.
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.
Please log in or register to report this question.
In …………….., the virus places an identical copy of itself into other programs or into certain system areas on the disk.
Answer: C
Correct answer: Propagation phase
Propagation is the phase in which the virus writes copies of itself into other programs or into system areas of the disk. The dormant phase is idleness, the triggering phase is the event that wakes it, and the execution phase is the payload.
Please log in or register to report this question.
Message digest needs to be
Answer: C
Correct answer: kept secret
If the digest travelled openly alongside the message, an attacker could alter the message and recompute the digest to match. The digest must therefore be protected - kept secret, encrypted, or bound to a key - or the whole check is worthless.
Please log in or register to report this question.
To protect yourself from computer hacker, you should turn on a
Answer: A
Correct answer: Firewall
A firewall inspects traffic entering and leaving the machine and blocks connections that are not permitted, which is what keeps an intruder from reaching the computer at all. Antivirus software deals with malicious code already present rather than with the connection.
Please log in or register to report this question.
Which of the following describes programs that can run independently travel from system to system and disrupt computer communication?
Answer: B
Correct answer: Worm
A worm is distinguished from a virus precisely by independence: it needs no host program and no user action, but propagates itself across a network, and the traffic it generates is what disrupts communication. Trojans do not self-propagate, and a dropper merely installs other malware.
Please log in or register to report this question.
In Message Integrity, message digest needs to be kept
Answer: A
Correct answer: Secret
The same reason: a digest an attacker can replace gives no protection, since the altered message would carry a correctly computed digest. Keeping it secret, or computing it with a secret key, is what makes the check meaningful.
Please log in or register to report this question.
What is a firewall?
Answer: C
Correct answer: A filter for an internet connection that monitors outgoing and incoming activity
A firewall works on connections, allowing or blocking traffic in both directions according to its rules. It is not concerned with the content of files, which is what antivirus software examines, and the name is a metaphor rather than a description.
Please log in or register to report this question.
