Decrypted: The tech police use against the public

There is a darker side to cybersecurity that's frequently overlooked.

Just as you have an entire industry of people working to keep systems and networks safe from threats, commercial adversaries are working to exploit them. We're not talking about red-teamers, who work to ethically hack companies from within. We're referring to exploit markets that sell details of security vulnerabilities and the commercial spyware companies that use those exploits to help governments and hackers spy on their targets.

These for-profit surveillance companies flew under the radar for years, but have only recently gained notoriety. But now, they're getting unwanted attention from U.S. lawmakers.

In this week's Decrypted, we look at the technologies police use against the public.

THE BIG PICTURESecrecy over protest surveillance prompts call for transparency

Last week we looked at how the Justice Department granted the Drug Enforcement Administration new powers to covertly spy on protesters. But that leaves a big question: What kind of surveillance do federal agencies have, and what happens to people's data once it is collected?

While some surveillance is noticeable - from overhead drones and police helicopters overhead - others are worried that law enforcement are using less than obvious technologies, like facial recognition and access to phone records, CNBC reports. Many police departments around the U.S. also use stingray" devices that spoof cell towers to trick cell phones into turning over their call, message and location data.