Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cloaker Catcher: A Client-based Cloaking Detection System   Cloaking has long been exploited by spammers for the purpose of increasing
the exposure of their websites. In other words, cloaking has long served as a
major malicious technique in search engine optimization (SEO). Cloaking hides
the true nature of a website by delivering blatantly different content to users
versus web crawlers. Recently, we have also witnessed a rising trend of
employing cloaking in search engine marketing (SEM). However, detecting
cloaking is challenging. Existing approaches cannot detect IP cloaking and are
not suitable for detecting cloaking in SEM because their search-and-visit
method leads to click fraud. In addition, they focus on detecting and measuring
cloaking on the server side, but the results are not visible to users to help
them avoid frauds.
  Our work focuses on mitigating IP cloaking and SEM cloaking, and providing
client-based real-time cloaking detection services. To achieve these goals, we
first propose the Simhash-based Website Model (SWM), a condensed representation
of websites, which can model natural page dynamics. Based on SWM, we design and
implement Cloaker Catcher, an accurate, efficient and privacy-preserving
system, that consists of a server that crawls websites visited by users on
demand and a client-side extension that fetches spider views of websites from
the server and compares them with user views to detect cloaking. Since Cloaker
Catcher checks on the client side for each real user, IP cloaking can be
detected whenever it occurs and click fraud in SEM can also be prevented. Using
our system, we conducted the first analysis of SEM cloaking and found that the
main purpose of SEM cloakers is to provide illicit services.

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The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph