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This is a really hard question to answer. The definitive answer can only be found in the source code of gpg. However I can still answer your question using a mail I found (from 2013, details may have changed). Is 2 "better" (i.e. more random) than 0? Yes, 2 is "better" than 0 and 1. As per the linked mail the quality level determines the number of ...


You could use message specific keys, which encrypt the messages themselves. Once a secret key has been established you can encrypt the message specific keys with it and send them over in a new message (with meta-data) to user B. You should of course have some method of storing the encrypted messages somewhere for this to work.

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