The cipher/code/puzzle known as Kno89 has haunted/allured/intrigued cryptographers/codebreakers/investigators for years/decades/centuries. It is said to hold the key/answer/solution to a mystery/secret/legend, but its complex/elaborate/obscure nature has eluded/confounded/baffled even the brightest/most skilled/talented minds. Whispers/Rumors/Legen