  Sufficiently strong security and privacy mechanisms are prerequisite to amass
the promising benefits of the IoT technology and to incorporate this technology
into our daily lives. This paper introduces a novel approach to privacy in
networks, an approach which is especially well matched with the IoT
characteristics. Our general approach is based on continually changing the
identifying attributes of IoT nodes. In particular, the scheme proposed in this
work is based on changing the IoT nodes' IP addresses, and because the changing
patterns of the IP addresses appear random to a non-intended observer, an
adversary is unable to identify the source or destination of a particular
transmission. Thus, packets that carry information generated by a particular
node cannot be linked together. The scheme offers additional security benefits,
including DoS mitigation, is relatively easy to implement, and requires no
changes to the existing networking infrastructure. We discuss the details of
the implementation of the scheme and evaluate its performance.
