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NEW QUESTION: 1
Which of the following attacks could be used to initiate a subsequent man-in-the-middle attack?
A. Brute force
B. Replay
C. ARP poisoning
D. DoS
Answer: B
Explanation:
A replay attack (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by IP packet substitution (such as stream cipher attack).
For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (posing as Alice) connects to Bob; when asked for a proof of identity, Eve sends Alice's password (or hash) read from the last session, which Bob accepts thus granting access to Eve.
Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a one-time token to Alice, which Alice uses to transform the password and send the result to Bob (e.g. computing a hash function of the session token appended to the password). On his side Bob performs the same computation; if and only if both values match, the login is successful. Now suppose Eve has captured this value and tries to use it on another session; Bob sends a different session token, and when Eve replies with the captured value it will be different from Bob's computation. Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as Bob, presenting some predicted future token, and convince Alice to use that token in her transformation. Eve can then replay her reply at a later time (when the previously predicted token is actually presented by Bob), and Bob will accept the authentication. One-time passwords are similar to session tokens in that the password expires after it has been used or after a very short amount of time. They can be used to authenticate individual transactions in addition to sessions. The technique has been widely implemented in personal online banking systems. Bob can also send nonces but should then include a message authentication code (MAC), which Alice should check. Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a secure protocol. For example Bob periodically broadcasts the time on his clock together with a MAC. When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her message, which is also authenticated. Bob only accepts messages for which the timestamp is within a reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-) random
numbers, with the trade-off being that replay attacks, if they are performed quickly enough
i.e. within that 'reasonable' limit, could succeed.
NEW QUESTION: 2
Brilliant Buys Local is a subsidiary of Brilliant Buys, and operates a number of smaller stores in local neighbourhoods.
The managing director of Brilliant Buys Local, Mr Davidson, has been given a scatter diagram with sales of each store based on the size of the local population.
Which of the following options outlines the best ways to interpret this diagram in this context?
Select ALL that apply.
A. Use the diagram to interpret that two of the stores with the highest sales are in areas with a medium-sized population
B. Rearrange the data points on the scatter diagram so that it shows any correlation more clearly
C. Use the diagram to interpret that the store with the lowest sales was in an area with a population of 5000
D. Draw a line of best fit by eye and estimate how much of a correlation there is between store sales and population
E. Use Pearson's coefficient to accurately draw a line of best fit
Answer: D,E
NEW QUESTION: 3
BCA is a long established international airline. Which of the following represent Threats to BCA's business?
Select ALL that apply
A. Greater popularity of long-haul holidays
B. A sudden increase in international terrorism
C. A shortage of trained pilots in BCA
D. A higher level of private car ownership
E. A substantial rise in the price of oil.
Answer: A,D