authenticate flag

[Aaron J. Graves]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I have created a key that for some reason does not have the "authenticate"
flag set. Is there a way I can somehow set this flag? Or do I have to start
from scratch?

Here's an example. From the key in question:

pub 1024D/9FB54294 created: 2006-09-17 expires: never usage: SC
trust: ultimate validity: ultimate
sub 4096g/DE94A6C4 created: 2006-09-17 expires: never usage: E

And from another key that has the flag set:
pub 1024D/34BAFE51 created: 2006-08-26 expires: 2011-08-25 usage: SCA
trust: ultimate validity: ultimate
sub 4096g/84400184 created: 2006-08-26 expires: 2011-08-25 usage: E

Notice the "A" in the usage section. How can I add that to my other key?
Or if it's not necessary, would it be possible to ask why?

Thanks very much for your time.
Aaron Graves

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (NetBSD)

iD8DBQFFgOvk20bIVZ+1QpQRAoO4AJoDx2aidK3hxLwQ1HJLxmSEL/EWWQCfaesO
oqThQE1wdHyERZm94BzK5c8=
=w2Dy
-----END PGP SIGNATURE-----