synaptic says packages are "NOT AUTHENTICATED"

[Jimmy Wu]

Hi,

I recently added the debian volatile to my synaptic sources list, with the
following line:deb http://volatile.debian.org/debian-volatile etch/volatile
main contrib non-free

Unfortunately, synaptic complains that packages from this source are not
authenticated.
What can I do to fix this?
On this site: http://www.debian.org/volatile/
 there is a section near the bottom called archive signing key.  Does that
have anything to do with the problem?  I've downloaded the files, but I
don't know what to do with them.

Thanks in advance,

Jimmy
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