cashe missing for fun and profit
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Title: cashe missing for fun and profit

Essay Details:

Subject: Technology
Author: John E
Date: April 25, 2016
Level: University
Grade: A
Length: 14 / 3963

Essay text:

Caches have already been demonstrated to be cryptograph-ically dangerous: Many implementations of AES [9] are subject to tim-ing attacks arising from the non-constancy of S-box lookup timings [1].However, having caches shared between threads provides a vastly moredangerous avenue of attack.2. Covert communication via pagingTo see how shared caches can create a cryptographic side-channel, wefirst step back for a moment to a simpler problem ?? covert channels [7]?? and one of the classic examples of such a channel: virtual memorypaging.Consider two processes, known as the Trojan process and the Spyprocess, operating at different privilege levels on a multilevel securesystem, but both with access to some large reference file (naturally, ona multilevel secure system this access would necessarily be read-only)...

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