After one district limited the websites students were allowed to visit, students realized that if they used a VPN, the restrictions couldn’t be detected or enforced. After another district blocked chat apps, the students figured out that they could chat using a shared Google Doc. That hack wasn’t new. It even has a name: foldering. In separate incidents, it was used by General Petraeus, Paul Manafort, and the 9/11 terrorists. They all realized that they could evade communications surveillance if they shared an email account with their co-conspirators and wrote messages to each other, keeping
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