Encryption, other privacy measures, and decentralization have made the protest movement possible...... A major priority of the protest movement that has consumed Hong Kong for the past three and a half months has been to thwart the surveillance apparatus that's virtually everywhere. Demonstrators have felled camera poles with chainsaws, spray-painted security camera lenses, used green lasers to destroy sensors, and shielded themselves with umbrellas while marching through the streets.....