Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tracking Users across the Web via TLS Session Resumption   User tracking on the Internet can come in various forms, e.g., via cookies or
by fingerprinting web browsers. A technique that got less attention so far is
user tracking based on TLS and specifically based on the TLS session resumption
mechanism. To the best of our knowledge, we are the first that investigate the
applicability of TLS session resumption for user tracking. For that, we
evaluated the configuration of 48 popular browsers and one million of the most
popular websites. Moreover, we present a so-called prolongation attack, which
allows extending the tracking period beyond the lifetime of the session
resumption mechanism. To show that under the observed browser configurations
tracking via TLS session resumptions is feasible, we also looked into DNS data
to understand the longest consecutive tracking period for a user by a
particular website. Our results indicate that with the standard setting of the
session resumption lifetime in many current browsers, the average user can be
tracked for up to eight days. With a session resumption lifetime of seven days,
as recommended upper limit in the draft for TLS version 1.3, 65% of all users
in our dataset can be tracked permanently.

10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics