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<n...@blacklist.anitech-systems.invalid> writes:
>Unruh wrote:
>> BlackLists writes:
>>> For anyone that cared enough about emissions,
>>> (and not about price) they could always get a
>>> EMSEC / TEMPEST, Level A / 1, PC.
>>
>>> {I've worked on a few TEMPEST PCs (decades in the past),
>>> it often takes 15 minutes of removing shielding panels
>>> just to get to where you can remove the shielded container
>>> a component (e.g. hard drive) is inside.
>>
>>
>> In one case to make it so that it does not destroy other
>> people's enjoyment of their system, and the other to make
>> sure a determined adversary cannot make use of yours.
>> Different boxes for different folks.
>Both are aimed at stopping unintentional emissions.
>Sure a TEMPEST PC would far exceed CE EMC / FCC Part 15 B, ...
> However weren't a few posts just complaining that those
> standards were not strict enough.
> TEMPEST is just stricter unintentional emission standards.
Of course. That was what I said. But the purpose is different. Tempest
is to make sure that the emissions cannot be used by someone else to
determine what is going on inside your box. The other standards are to
prevent your machine from ruining other people's use of the
electromagnetic spectrum. That is a much more relaxed standard. But the
way the formal regulations are written allow one to continue emitting huge
amounts of
radiation, messing up other people's use of the radiation spectrum, as
long as it is spread around and not all emitted at some specific
frequency. Ie, the standard should probably limit the amount of
radiation emitted, not the amount emitted in some very narrow bandwidth,
or rather it should limit both.
Note that Tempest is where you want to limit the radiation and thus have
a strong incentive to make sure you emit as little as possible. The
radiation standards are where others want you to limit your radiation
and thus you have an incentive to try to find a way around the law to
save those few pennies that shielding would cost.
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