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Re: [smime] [pkix] Research question: Witnessing by digital signature

2010-06-15 09:50:28
On Fri, 2010-06-11 at 06:01 +1000, Stephen Wilson wrote:
Has any work been done in PKIX or elsewhere on formal witnessing of 
digital signatures?  And/or ... does anyone in the group know of real 
life instances where a digital signature is witnesses and attested to 
using another dig sig?

How would one "witness" a digital signature?  To witness a physical
signature means that one has personal knowledge that the signer
intentionally signed the document.  Simply adding a digital signature to
a document bearing someone else's digital signature is not witnessing in
this sense.


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