@misc{BJR17,
  author =      { Kevin D. Bowers and Ari Juels and Ronald L. Rivest },
  title =       { Wireless wearable authenticators using attachment to confirm
                  user possession },
  howpublished = { U.S. Patent 9,740,844.  Issued August 22, 2017. },
  date =        { 2017-08-22 },
  OPTmonth =    { August 22, },
  OPTyear =     { 2017 },
  urla =        { <a href="https://patents.google.com/patent/US9740844B1/en">text(google)</a> },                  
  abstract =    { Wireless wearable authenticators (WWAs) are provided
                  using attachment to confirm user possession of the
                  WWA. A user is authenticated by receiving
                  authentication information from a wireless, wearable
                  authentication (WWA) device of the user. The
                  authentication information indicates whether the
                  user has substantially continuously worn the WWA
                  since a prior session where the user proved his or
                  her identity to a relying device while wearing the
                  WWA. The user is authenticated based on an
                  evaluation of the authentication information. The
                  authentication information comprises, for example, a
                  credential .kappa. and a current session label J. A
                  value of the current session label J can provide the
                  indication of whether the user has substantially
                  continuously worn the WWA since a prior session
                  where the user proved his or her identity to a
                  relying device while wearing the WWA.
                 }
}