  Private messaging over internet related services is difficult to implement.
Regular end-to-end encryption messaging systems are prone to man in the middle
attacks and only hide messages but not the identity of its users. For example,
WhatsApp offers a strong privacy guarantee but does not hide much Metadata
because it uses end-to-end encryption. Other messaging systems such as Skype
can be monitored by government agencies and have backdoors implemented into its
software. Zephyr is an anonymous messaging system that protects the privacy of
message contents and message metadata. Users that use Zephyr do not reveal who
they are talking to or the contents of their messages. The goal of Zephyr is to
decrease the amount of information being sent by the user and hide as much
metadata as possible.
