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If u need to send a mssg to your frnd but doesn't want it to be seen by anyother than your frnd then it could be done like this write the message and pull friend's public key off a public key server and encrypt the message with friend's public key and send the encrypted message to your friend .after your friend receives the message she/he will use her private key and decrypts the message.
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i want it theortically with the help of pen and paper
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