  With the advent of cheap computing through five decades of continued
miniaturization following Moores Law, wearable devices are becoming
increasingly popular. These wearable devices are typically interconnected using
wireless body area network (WBAN). Human body communication (HBC) provides an
alternate energy-efficient communication technique between on-body wearable
devices by using the human body as a conducting medium. This allows order of
magnitude lower communication power, compared to WBAN, due to lower loss and
broadband signaling. Moreover, HBC is significantly more secure than WBAN, as
the information is contained within the human body and cannot be snooped on
unless the person is physically touched. In this paper, we highlight
applications of HBC as (1) Social Networking (e.g. LinkedIn/Facebook friend
request sent during Handshaking in a meeting/party), (2) Secure Authentication
using human-human or human-machine dynamic HBC and (3) ultra-low power, secure
BAN using intra-human HBC. One of the biggest technical bottlenecks of HBC has
been the interference (e.g. FM) picked up by the human body acting like an
antenna. In this work, for the first time, we introduce an integrating dual
data rate (DDR) receiver technique, that allows notch filtering (>20 dB) of the
interference for interference-robust HBC.
