CM Poncelet wrote:

>PGP allows sending encrypted emails/data to multiple recipients, where

>each recipient has a different private key, and this works AOK (but no

>idea how). 

 

Trivial: the actual payload is encrypted with a random symmetric key. Then THAT 
key is encrypted with the public key of each
recipient, and the package sent contains a copy for each recipient. So in 
pseudo-crypto(!), if the data is being sent to Phil,
Charles, and CM, the package contains:

 

This is for Phil: < copy of key K, encrypted with Phil's public key and 
possibly sender's private key>

This is for Charles: < copy of key K, encrypted with Charles's public key and 
possibly sender's private key>

This is for CM: < copy of key K, encrypted with CM's public key and possibly 
sender's private key>

<payload, encrypted with key K>

 

Make sense?

 

...phsiii


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