@misc{NABDx15,
  title =     { System and method providing disconnected authentication },
  author =    { Nanopoulos, A. and Ackerman, K. and Bowness, P. and Duane, W. and Jakobsson, M.
                and Kaliski, B. and Pal, D. and Rice, S.D. and Rivest, R.L. },
  howpublished = { U.S. Patent 8,966,276.  Issued February 24, 2015. },                  
  urla =      { <a href="https://www.google.com/patents/US8966276">google-patent-page</a> },
  date =      { 2015-02-24 },                  
  OPTmonth =  { February 24, },
  OPTyear =   { 2015 },
  abstract =  { In a system for disconnected authentication,
                  verification records corresponding to given
                  authentication token outputs over a predetermined
                  period of time, sequence of events, and/or set of
                  challenges are downloaded to a verifier. The records
                  include encrypted or hashed information for the
                  given authentication token outputs. In one
                  embodiment using time intervals, for each time
                  interval, token output data, a salt value, and a
                  pepper value, are hashed and compared with the
                  verification record for the time interval. After a
                  successful comparison, a user can access the
                  computer. A PIN value can also be provided as an
                  input the hash function. A portion of the hash
                  function output can be used as a key to decrypt an
                  encrypted (Windows) password, or other sensitive
                  information.  },
}