For a fascinating (and also horrifying) view at how truly ubiquitous computing could look like, read "A Deepness in the Sky" by Vernor Vinge (published 1999!).
One plot point is about "smart dust" being used for total surveillance (everyone's facial expression, heart rate, etc. being monitored for irregularities at all times) and then subverted via a backdoor thousands of years old that's activated by the right sequence of body movements...
One plot point is about "smart dust" being used for total surveillance (everyone's facial expression, heart rate, etc. being monitored for irregularities at all times) and then subverted via a backdoor thousands of years old that's activated by the right sequence of body movements...