@Misc{Riv12d,
  author =       { Ronald L. Rivest },
  title =        { Turing and the Growth of Cryptography },
  howpublished = { Invited talk at Boston University Turing 100 Celebration. },
  date =         { 2012-11-11 },                  
  OPTmonth =     { November 11-12, },
  OPTyear =      { 2012 },
  urla =         { <a href="http://www.bu.edu/cphs/colloquium/colloquia/53rd.htm#turing">event</a> },
}