The insert method and other variants of QUANTUM are closely linked to a shadow network operated by the NSA alongside the Internet, with its own, well-hidden infrastructure comprised of “covert” routers and servers. It appears the NSA also incorporates routers and servers from non-NSA networks into its covert network by infecting these networks with “implants” that then allow the government hackers to control the computers remotely. In this way, the intelligence service seeks to identify and track its targets based on their digital footprints. These identifiers could include certain email addresses or website cookies set on a person’s computer. Of course, a cookie doesn’t automatically identify a person, but it can if it includes additional information like an email address. In that case, a cookie becomes something like the web equivalent of a fingerprint.