On Thu, 16 Oct 1997, John Horne wrote:
> Is it possible to truly verify that a message has come from a specified user?
If it has come from outside your machine, no, unless you use encryption.
You can check the IP address of the calling host; you can check the ident
information that that host sent you, but every byte in the message
itself can be forged.
Consider the equivalent: an envelope that drops through your front door.
Is it possible to truly verify that it comes from a specified person
just by looking at its contents?
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Philip Hazel University Computing Service,
ph10@??? New Museums Site, Cambridge CB2 3QG,
P.Hazel@??? England. Phone: +44 1223 334714
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