Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Privacy Risks of Public WiFi Captive Portals   Open access WiFi hotspots are widely deployed in many public places,
including restaurants, parks, coffee shops, shopping malls, trains, airports,
hotels, and libraries. While these hotspots provide an attractive option to
stay connected, they may also track user activities and share user/device
information with third-parties, through the use of trackers in their captive
portal and landing websites. In this paper, we present a comprehensive privacy
analysis of 67 unique public WiFi hotspots located in Montreal, Canada, and
shed some light on the web tracking and data collection behaviors of these
hotspots. Our study reveals the collection of a significant amount of
privacy-sensitive personal data through the use of social login (e.g., Facebook
and Google) and registration forms, and many instances of tracking activities,
sometimes even before the user accepts the hotspot's privacy and terms of
service policies. Most hotspots use persistent third-party tracking cookies
within their captive portal site; these cookies can be used to follow the
user's browsing behavior long after the user leaves the hotspots, e.g., up to
20 years. Additionally, several hotspots explicitly share (sometimes via HTTP)
the collected personal and unique device information with many third-party
tracking domains.

22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
2
The categories of this paper are: math
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th