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.Schneier points out that such cases are often used by the government to illustrate the dangers of allowing regular people to encrypt data. "How can we allow people to use strong encryption, they ask, if it means not being able to convict monsters like Duncan?"
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.
Schneier does a good job pointing out a few reasons why, but he dances around one of the most obvious: If Duncan thought the diary would be readable now, he never would have written it. His goal was a delayed release. He wanted to wait 30 years before the details of his confession were known. I guess it was an attempt to secure some sort of perverted legacy. But he never would have done so if he thought it would be released now (and used against him).
Encryption didn't allow him to commit the crimes, nor did it allow him to cover up the crime, as the data was encrypted under the assumption that it could not be broken for 30 years (which seems to be to be an unwise assumption, but look who we're talking about here). Indeed, since it is quite possible that the authorities will break the diary in the short term, you could even argue that encryption is actually helping the authorities prosecute the man (as he wouldn't have written the diary in the first place if he knew it would be broken so quickly). Could the fact that he knew he could encrypt a confession contribute to his motivation for the crimes? I doubt it, but stranger things have happened.
All technology is a double edged sword: they have good and bad uses and they're used by honest citizens and criminals alike. Except, as Schneier notes, the good usually outweighs the bad for almost all technologies.