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There are side channels and there are side channels. A computer fan outputting noise is a side channel that indicates both that a computer is running and may in
by teruakohatu 6y ago
There are side channels and there are side channels. A computer fan outputting noise is a side channel that indicates both that a computer is running and may indicate something about the workload, but if you are close enough to hear it, you are close enough to do a lot more than listen to the fan noise so there is no real more in suppressing it.
Isolated processes being able to determine the memory or computation of another process is something else altogether and surley could be mitigated, even if the mitigation comes at a cost.
- xxs 6y agoYou can have the fan on fixed rpms, hence the only side channel is that the machine has power.
- paholg 6y agoBut that would be wasteful and needlessly noisy. The point was that there is no need.
- mschuster91 6y agoThere's more. Vibration and electromagnetic emissions (TEMPEST) are also viable side channels. Or ultrasound in speakers to cross airgaps.