Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Designing a Location Trace Anonymization Contest   For a better understanding of anonymization methods for location traces, we
have designed and held a location trace anonymization contest. Our contest
deals with a long trace (400 events per user) and fine-grained locations (1024
regions). In our contest, each team anonymizes her original traces, and then
the other teams perform privacy attacks against the anonymized traces in a
partial-knowledge attacker model where the adversary does not know the original
traces. To realize such a contest, we propose a location synthesizer that has
diversity and utility; the synthesizer generates different synthetic traces for
each team while preserving various statistical features of real traces. We also
show that re-identification alone is insufficient as a privacy risk and that
trace inference should be added as an additional risk. Specifically, we show an
example of anonymization that is perfectly secure against re-identification and
is not secure against trace inference. Based on this, our contest evaluates
both the re-identification risk and trace inference risk and analyzes their
relationship. Through our contest, we show several findings in a situation
where both defense and attack compete together. In particular, we show that an
anonymization method secure against trace inference is also secure against
re-identification under the presence of appropriate pseudonymization.

23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th