For example, I could request that someone send me a signature
on some data I received earlier. They could create a signature on
data and send it to me, without having to re-send the data itself.
My mistake, I see what you mean now.
That would be very useful for software distribution - perhaps a mime type as
for certifcate distribution would be useful, e.g. Content-Type:
Black Paw Communications
Using MailCat for Win32 Beta Vs 18.104.22.168, on December 1, 1997, in Win95