Breaking the BTK Killer's Cipher
For over 30 years, a serial killer terrorized Kansas and the surrounding areas, his modus operandi: Bind, Torture, Kill. While many are exceedingly familiar with the notorious BTK murders, few are aware of the existence of a cipher written by the BTK killer. This article introduces the BTK killer, the cipher system he employed, and the cryptanalysis of the enciphered message that he himself could not remember how to break.
btk serial killer cryptanalysis bifid cryptanalysis and racketeering records unit dennis rader fractionating cipher