Currently, research on providing security solutions
for WSNs has mainly focused on key management [9],
authentication, and secure routing [10], as well as secure
services including secure localization [11] and secure
aggregation [12]. A few secure ranging and localization
protocols were specifically designed for protecting the
integrity of ranging and for addressing location-related
attacks in UWB WSNs [13-16]. Signaling schemes have
also been proposed to improve physical layer security
of UWB systems [8]. Finally, a number of routing and
clustering protocols attempt to address networking issues
in UWB WSNs [17], lacking however advanced security
features in their design.