So he fills in his information, and then after that,  all he has to do is click "send," and just like that, without understanding cryptography, and without doing anything different from how he writes email today, Bob has just sent an encrypted message.
Preenche as suas informações, e, depois disso, basta clicar em "enviar", tal e qual assim,  sem perceber nada de criptografia. Sem fazer nada de diferente  do costume para escrever "emails", Bob acaba de enviar  uma mensagem encriptada.