Going back to Jonathan's (I think) question. Does anyone use this at all in
the field?

-Ekr


On Tue, Apr 25, 2017 at 6:10 AM, Kurt Roeckx <k...@roeckx.be> wrote:

> On 2017-04-25 00:04, Martin Thomson wrote:
> > I think that 60Hz is too high a rate for this.
> >
> > I suggest that we restrict this to top-level, foreground, and secure
> > contexts.  Note that foreground is a necessary precondition for the
> > attack, so that restriction doesn't really help here.  Critically,
> > rate limit access much more than the 60Hz recommended for the
> > accelerometer.  5Hz might be sufficient here, maybe even lower.
>
> Note that they already talk about 2Hz being the rate they think is
> realistic to do their attack, and that 5Hz is probably an upper bound of
> their attack, so reducing it from 60 to 5 doesn't actually change anything
> and you would need to go even lower. You could for instance do something
> like only allowing it 1 time per minute, and require user approval for
> higher frequencies.
>
> The other suggestion they have in their paper is to reduce the number of
> values you return, say 4 different values.
>
>
> Kurt
>
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