Joseph Duncan III is a computer expert who bragged online, days before authorities believe he killed three people in Idaho, about a tell-all journal that would not be accessed for decades, authorities say.
Duncan, 42, a convicted sex offender, figured technology would catch up in 30 years, "and then the world will know who I really was, and what I really did, and what I really thought," he wrote May 13.
Police seized Duncan's computer equipment from his Fargo apartment last August, when they were looking for evidence in a Detroit Lakes, Minn., child molestation case.
At least one compact disc and a part of his hard drive were encrypted well enough that one of the region's top computer forensic specialists could not access it, The Forum reported Monday.
Detective Jess Schoon, a Fergus Falls (Minn.) officer and a specialist for the Minnesota Internet Crimes Against Children Task Force, checked the equipment for evidence in the Detroit Lakes case.
"Without a doubt the most challenging system I've looked at," Schoon said of Duncan's encryption.
Most of the seized discs and computer files were accessible and revealed nothing significant, he said. But he could not get at the hidden data.
"Nobody that I know of has the ability to crack that encryption," Schoon said.