newbie question about identities

[Atom 'Smasher']

i'm only a few years behind with gpg/pgp, but trying to get up to
speed....

i like the idea of identities, but i'm not sure if i'm either missing
something, or if that part of the system (or documentation) is flawed....

let's say i have 2 identities....
        employee@big-corp
         radical@big-corp-sucks

obviously, each of these identities should be kept *FAR* apart.

according to the documentation [that i've found], all you have to do is
use the gpg "edit-key" and "adduid" to add an ID to your key-pair, and
then you can use one key-pair for multiple IDs.
	http://www.gnupg.org/gph/en/manual.html#AEN282

i see 2 problems with this:
1) the key-id is the same for both roles
2) when exporting the public key, both identities are part of it

both of these factors make it too easy for one's "other" identity to be
revealed... this could be bad (very bad, since keys are like viruses,
and can't be removed from circulation).

so the question is, am i missing something? or is this a fact of life if a
single key-pair is used for multiple IDs? if one wants to use multiple
IDs (and keep each ID isolated from all other IDs), is it necessary that
each ID has it's own key-pair?


        ...atom

----------------Void-If-Detached----------------
http://smasher.suspicious.org/fs1r  Yamaha FS1R

	Quidquid latine dictum sit, altum viditur.
	(Whatever is said in Latin sounds profound.)