"David E. Smith" writes:
The right way to do this in the digital world, IMHO, is to have a standard for "Power of Attorney" documents, and for the entity receiving something signed in your key that should be signed in another person's key to also see the digitally signed power of attorney document. Then the entity can check the signature on the power of attorney was in Helen's key, and that the signed key in that document was the key that signed the document signed by the "attorney".
That's more of what I was looking for. I suppose that (I'm still using PGP as my example) there could be a shared PGP key, signed by Helen and myself, where only the two of us know the passphrase,
Huh? Why? Why would you need such a thing? If you reread what I wrote above, you would see that such a thing is completely unneeded. Perry