Certificate proposal

[Hal]

Jeff Weinstein <jsw at netscape.com> writes:
>  I think the old idea of a certificate just binding a name and
>a key is turning out to not be very useful.  That is why Netscape
>Navigator 2.0 will support x509 version 3 certificates.  They allow
>arbitrary attributes to be signed into a certificate.  In this new
>world, you can think of a certificate as a way of binding a key with
>various arbitrary attributes, one of which may be(but is not
>required to be) a name.

OK, so suppose I want to send my credit card number to Egghead Software.
I get one of these new-fangled certificates from somebody, in which
VeriSign has certified that key 0x12345678 has hash 0x54321.  I think we
can agree that by itself this is not useful.  So, it will also bind in
some attribute.  What will that attribute be?

Hal