@TechReport{Dartmouth:TR2001-412,
  author = {Hany Farid},
  title = {{Detecting Steganographic Messages in Digital Images}},
  institution = {Dartmouth College, Computer Science},
  address = {Hanover, NH},
  number = {TR2001-412},
  year = {2001},
  month = {September},
  URL = {http://www.cs.dartmouth.edu/reports/TR2001-412.ps.Z},
  abstract = {
    Techniques and applications for information hiding have
    become increasingly more sophisticated and widespread. With
    high-resolution digital images as carriers, detecting the presence of
    hidden messages has also become considerably more difficult. It is
    sometimes possible, nevertheless, to detect (but not necessarily
    decipher) the presence of embedded messages. The basic approach taken
    here works by finding predictable higher-order statistics of
    ``natural'' images within a multi-scale decomposition, and then
    showing that embedded messages alter these statistics.
  }
}