EU cybersecurity policy body ENISA has warned against building backdoors into encryption to counter criminals and terrorists. Backdoors could end up being more like an open door, says the agency. Backdoors only work well when the people targeted by them dont know theyre there, says ENISA. The agency offers a number of arguments in support of its conclusion, which can be summed up with reference to the unwritten first law of backdoors: they only work best when the targeted people don’t know they’re there.”]