& gt& gt& gt(bob_pub，bob _ priv)= RSA . new keys(5 12)

& gt& gt& gtmessage =' Hello, Bob!'

& gt& gt& gtcrypto = rsa.encrypt (message, bob_pub)

& gt& gt& gtmessage = rsa.decrypt(crypto，bob_priv)

& gt& gt& gt Print messages

Hello, Bob!