@article{DBLP:journals/ieeesp/YanBAG04,
  author    = {Jeff Jianxin Yan and
               Alan F. Blackwell and
               Ross J. Anderson and
               Alasdair Grant},
  title     = {Password Memorability and Security: Empirical Results},
  journal   = {IEEE Security {\&} Privacy},
  volume    = {2},
  number    = {5},
  year      = {2004},
  pages     = {25-31},
  ee        = {http://doi.ieeecomputersociety.org/10.1109/MSP.2004.81},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  abstract = {

Users rarely choose passwords that are both hard to guess and easy to remember.
To determine how to help users choose good passwords, the authors performed a
controlled trial of the effects of giving users different kinds of advice. Some
of their results challenge the established wisdom.  

  }
}