  The virtual dimension called `Cyberspace' built on internet technologies has
served people's daily lives for decades. Now it offers advanced services and
connected experiences with the developing pervasive computing technologies that
digitise, collect, and analyse users' activity data. This changes how user
information gets collected and impacts user privacy at traditional cyberspace
gateways, including the devices carried by users for daily use. This work
investigates the impacts and surveys privacy concerns caused by this data
collection, namely identity tracking from browsing activities, user input data
disclosure, data accessibility in mobile devices, security of delicate data
transmission, privacy in participating sensing, and identity privacy in
opportunistic networks. Each of the surveyed privacy concerns is discussed in a
well-defined scope according to the impacts mentioned above. Existing
countermeasures are also surveyed and discussed, which identifies corresponding
research gaps. To complete the perspectives, three complex open problems,
namely trajectory privacy, privacy in smart metering, and involuntary privacy
leakage with ambient intelligence, are briefly discussed for future research
directions before a succinct conclusion to our survey at the end.
