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Mary is Mary


At 06:54 PM 5/22/97 -0300, E. Gerck wrote:
>However, if Mary also co-signs the certificate that still proves nothing
>because the verifier has no way of knowing that Mary *is* Mary -- say, by
>independent channels of information and must only trust Jon, again.

Knowing "Mary *is* Mary" harks back to the way humans lived all our lives, 
until a few years ago when the Internet went popular.  That is, we lived in 
small closed communities where names meant something.  We no longer do.  The 
mapping between the text string "Mary Smith" and some 3D world person is not 
commonly known to everyone who might be involved in some transaction.  
Therefore, the notion that "Mary is Mary" has no definite meaning -- not like 
it had in the days when you were born, lived and died in a small community 
where everyone knew everyone else and all names in that community were 
unique and unchanging to a very high probability.

The X.500 attempt to make a global name directory and the commercial CA 
attempt to bind such names to physical people are attempts, in a way, to 
address this new reality.  However, they are IMHO misguided.  The issue is 
that contacts between physical people are for many purposes never involved 
so the mapping to them (or from them or, worse, through them) is irrelevant 
at best and a design flaw at worst in a system design which supports the 
cyberspace contact and transactions between people.  A global name space is 
so large that it's no longer even useful for knowing with certainty that you 
have the mapping to a person you really have met in the 3D world.  That's 
why SDSI dropped the global name space as a dead idea.

 - Carl

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|Carl M. Ellison  cme@cybercash.com   http://www.clark.net/pub/cme |
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