Man-in-the-middle attack is a form of active eavesdropping in which the attacker makes independent connections with the victims and relays messages between them, making them believe that they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker. Secfone shields you from man-in-the-middle attacks by having unique encryption keys pre-installed on the device which providing trustworthy peer authentication.