Computers and Technology, 14.06.2021 06:10 Frankia

What does Salting put in a password hash to make it safer from cracking, and what does HMAC put in a password to also make it safer from cracking?

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Computers and Technology, 22.06.2019 03:30

Some of your friends have gotten into the burgeoning field of time-series data mining, in which one looks for patterns in sequences of events that occur over time. purchases at stock exchanges--whatâ€™s being bought-- are one source of data with a natural ordering in time. given a long sequence s of such events, your friends want an efficient way to detect certain "patterns" in them--for example, they may want to know if the four events buy yahoo, buy ebay, buy yahoo, buy oracle occur in this sequence s, in order but not necessarily consecutively. they begin with a collection of possible events (e.g., the possibleâ€™ transactions) and a sequence s of n of these events. a given event may occur multiple times in s (e.g., yahoo stock may be bought many times in a single sequence s). we will say that a sequence sâ€™ is a subsequence of s if there is a way to delete certain of the events from s so that the remaining events, in order, are equal to the sequence sâ€™. so, for example, the sequence of four events above is a subsequence of the sequence buy amazon, buy yahoo, buy ebay, buy yahoo, buy yahoo, buy oracle their goal is to be able to dream up short sequences and quickly detect whether they are subsequences of s. so this is the problem they pose to you: give an algorithm that takes two sequences of even~s--sâ€™ of length m and s of length n, each possibly containing an event more than once--and decides in time o(m n) whether sâ€™ is a subsequence of s

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To move a file or folder in microsoft windows, you can click and hold down the left mouse button while moving your mouse pointer to the location you want the file or folder to be, which is also known as.

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