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There is far too much data on the Internet for human investigators to manually search through all of it.
Therefore, automated Internet surveillance computers sift through the vast amount of intercepted Internet traffic to identify and report to human investigators the traffic that is considered interesting or suspicious.
Such software could be installed physically or remotely.
Originally developed for counterterrorism purposes by the military, they work by broadcasting powerful signals that cause nearby cell phones to transmit their IMSI number, just as they would to normal cell phone towers.
Once the phone is connected to the device, there is no way for the user to know that they are being tracked.
Computers can be a surveillance target because of the personal data stored on them.
If someone is able to install software, such as the FBI's Magic Lantern and CIPAV, on a computer system, they can easily gain unauthorized access to this data.
Surveillance can be viewed as a violation of privacy, and as such is often opposed by various civil liberties groups and activists.