When using PGP type public encrypted communication, would it be a good idea to generate a new public for each message and attach that in the new public key in the reply to back to sender mail body? Idea is you start the communication with the known public key from a key server, but for each new message/chat message you generate a new public/private key for that particular end-user. That way if someone cracks your initial public/private key they may not read all the messages? Would that be a good or bad idea? Ie the person who want to read your mail conversation must crack all PGP keys in the conversation sequence to read all the messages.