QUOTE (nezumi @ Jul 16 2008, 07:02 PM)
I'm guessing these numbers are still about as secret as SSNs, yes? So you still can't introduce yourself as 456-806-5521, nor can you have an ID card with that printed, although I suppose you can write it on your underwear.
that would depend on how its expected to be used.
as i have learned, there are two ways to use these numbers.
1. identifier:
http://en.wikipedia.org/wiki/Identifier2. authenticator:
http://en.wikipedia.org/wiki/Authenticatoronly the last one needs to be secret, as the knowledge of it verifies who you are. its a secret handshake or pin number. basically something only the correct person should know.
this may also help explain how to use a SIN in sr depending on whats going on.
if your buying something or showing id to security, they will probably only try to match your biological data (or a known only to you secret, like a pin) vs whats on file under whatever SIN your presenting. if those two match, your most likely (nothing is ever 100%) who you claim to be.
now, if they instead would run the biological data as a unknown, and try to match it to any and all SIN holders, things could get a bit more interesting. but that would be time consuming if all your doing is buying something from stuffer shack or unlocking some office door.
edit:
err, i may have not been fully clear just now. thing about the SIN in the example about is that its just an identifier, or as the wikipedia article say, a name. the biological data is the authenticator part. the part that verifies that your the person who the SIN/name belongs to.
now if we where to go a bit further on that name thing, think about your own name. its probably at least two parts, one your personal name, and the other your family name. that family name are a kind of link to a source of authentication in a local community. by knowing both, someone can locate some relative and authenticate who you are. the personal name on the other hand is a identifier within that family.