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Slide #8 in the presentation you linked to describes the way Käsper and Schwabe pack the bits of the AES data blocks into CPU registers. According to the slide, what they're doing is processing eight 128-bit AES blocks in parallel, using eight 128-bit XMM registers to store them. They're not doing basic "naïve bitslicing", which would involve using 128 $n$-...


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The Encryption is not likely Compression where one can choose Normal, High or Low or something from scale of 0-100 as you mentioned. If you really want to do it, you can think of it in two ways Reduce the keyspace, as already mentioned in an above answer Reduce the Rounds. But these both will lead to a situation where you may end up in a breakthrough (...



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