> I disagree with this.  Obviously a bad signature doesn't say much (except 
> perhaps "check your mail system - it's breaking things"), but there is still 
> value in the continuity between multiple signed messages.  It's important to 
> not make of that more than it is: for all I know there are 200 people all 
> sharing key 1CF3A917, but it does raise the bar for someone who wants to 
> claim to be Martin.

I used to believe this, up until John Moore, John Clizbe and I did a small 
experiment on PGP-Basics.  We all shared a certificate and used it to sign our 
emails.  It was literally weeks before anyone noticed.

Continuity is a great idea, but based on my own (limited and anecdotal) 
experience, it does not play a significant role in the real world.  
Unfortunately, I don't have anything more empirical to stand upon than that one 
ad-hoc experiment!


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