There are a couple of things that feel concerning about this from a security perspective, as it's optimizations like this that could create another spectre clas

There are a couple of things that feel concerning about this from a security perspective, as it's optimizations like this that could create another spectre class vulnerability. Mixing cache lines arbitrarily seems bad when you think of virtualization and the dream of memory isolation, you would need a lot more holding data to maintain such an optimization. It is also hard not to be a crypto snob when the author writes 'secure hash' and indicates single DES as a remedy. I also don't like that there is a claimed speedup figure but it is not clear in a cursory reading and looking at the available tables and graphs what the baseline is? It's all done in emulation (apparently) so it's hard to know if it is amortized because there is no actual time to access or something else, but that could just be my unfamiliarity with that emulator.