[cryptography] Security Pop-Up of the Day

James A. Donald jamesd at echeque.com
Thu Sep 22 19:18:06 EDT 2011

On Thu, Sep 22, 2011 at 09:37:42AM +1000, James A. Donald wrote:
>> Email client generates private/public keypair.  Sends public key to CA
>> server.  CA server certifies that the owner of the private key
>> corresponding to this public key is capable of receiving email at the
>> address, emails certificate it back to ostensible email address.

On 2011-09-22 8:35 PM, Paul Walker wrote:
> User changes email client, or has two clients on different machines. Second
> certificate is received by CA server. Does it now certify both keys?

Sure - what the certificate is a certificate of is that the holder of 
the corresponding private key can receive email at this address.  He 
should have as many certificates as he has email clients.

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