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RFC2630: Need clarification

2001-01-03 04:33:16
Hi!
At first a happy new year to all!

I need a clarification to following sentence from RFC 2630,
section 11.4, Countersignature:
"The countersignature attribute must be an unsigned attribute; it
 cannot be a signed attribute, an authenticated attribute, or an
 unauthenticated attribute."

What is the difference between: 
a) signed attribute <-> authenticated attribute
b) unsigned attribute <-> unauthenticated attribute
to relate to CMS?

Where is located a (un)authenticated attribute in an
signed-data CMS?
I thought, it exist as (un)signed attribute in the SignerInfo,
or is this complete beside them?


Thanks in advance
with kind regards
-- 
Mors certa, hora incerta. In dubio pro mille.
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