Asecurity analyst is doing a vulnerability assessment on a database server. a scanning tool returns the following information:
database: customeraccess1
column: password
data type: md5 hash
salted? : no
there have been several security breaches on the web server that accesses this database. the security team is instructed to mitigate the impact of any possible breaches. the security team is also instructed to improve the security on this database by making it less vulnerable to offline attacks. which of the following would best accomplish these goals? (select two).
start using salts to generate md5 password hashes
generate password hashes using sha-256
force users to change passwords the next time they log on
limit users to five attempted logons before they are locked out
require the web server to only use tls 1.2 encryption

The idea that, for each pair of devices v and w, there’s a strict dichotomy between being “in range” or “out of range” is a simplified abstraction. more accurately, there’s a power decay function f (·) that specifies, for a pair of devices at distance δ, the signal strength f(δ) that they’ll be able to achieve on their wireless connection. (we’ll assume that f (δ) decreases with increasing δ.) we might want to build this into our notion of back-up sets as follows: among the k devices in the back-up set of v, there should be at least one that can be reached with very high signal strength, at least one other that can be reached with moderately high signal strength, and so forth. more concretely, we have values p1 ≥ p2 ≥ . . ≥ pk, so that if the back-up set for v consists of devices at distances d1≤d2≤≤dk,thenweshouldhavef(dj)≥pj foreachj. give an algorithm that determines whether it is possible to choose a back-up set for each device subject to this more detailed condition, still requiring that no device should appear in the back-up set of more than b other devices. again, the algorithm should output the back-up sets themselves, provided they can be found.\