Links

• http://frode.home.cern.ch/frode/crypto/simula/purple/index.html
  
  
• http://www.nsa.gov/cch/cch00005.cfm
  
  
• http://www.gvsu.edu/math/enigma/Purple/Welcome.htm
  
  
• http://www.arlingtoncemetery.net/wfried.htm
  
  
• http://en.wikipedia.org/wiki/PURPLE
  
  
• http://home.ecn.ab.ca/~jsavard/crypto/ro020304.htm
  
  
• http://corregidor.org/chs_crypto1/purple.htm