"It's this last option that makes Callisto unique," writes Olga Khazan. "Most rapes are committed by repeat offenders, yet most victims know their attackers. Some victims are reluctant to report assaults because they aren't sure whether a crime occurred, or they write it off as a one-time incident. Knowing about other victims might be the final straw that puts an end to their hesitation—or their benefit of the doubt. Callisto's creators claim that if they could stop perpetrators after their second victim, 60 percent of campus rapes could be prevented." This kind of system is based partly on a Michigan Law Review article about "information escrows," or systems that allow for the transmitting of sensitive information in ways that reduce "first-mover disadvantage" also known to economists as the "hungry penguin problem". As game theorist Michael Chwe points out, the fact that each person creates her report independently makes it less likely they'll later be accused of submitting copycat reports, if there are similarities between the incidents.
A link to the NY Times article now redirects readers to a separate, general article on the attacks, which does not contain the word "encrypt." The Times later posted a second article citing an anonymous "European counterterrorism official" who was quoted saying authorities' "working assumption is that these guys were very security aware," but clarified officials "offered no evidence."