  Radio Frequency fingerprinting enables a passive receiver to recognize and
authenticate a transmitter without the need for cryptographic tools.
Authentication is achieved by isolating specific features of the transmitted
signal that are unique to the transmitter's hardware. Much research has focused
on improving the effectiveness and efficiency of radio frequency fingerprinting
to maximize its performance in various scenarios and conditions, while little
research examined how to protect devices from being subject to radio
fingerprinting in the wild.
  In this paper, we explore a novel point of view. We examine the hostile usage
of radio frequency fingerprinting, which facilitates the unauthorized tracking
of wireless devices in the field by malicious entities. We also suggest a
method to sanitize the transmitted signal of its fingerprint using a jammer,
deployed on purpose to improve devices' anonymity on the channel while still
guaranteeing the link's quality of service. Our experimental results and
subsequent analysis demonstrate that a friendly jammer can effectively block a
malicious eavesdropper from recognizing and tracking a device without affecting
the quality of the wireless link, thereby restoring the privacy of the user
when accessing the radio spectrum.
