Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BlindSignedID: Mitigating Denial-of-Service Attacks on Digital Contact
  Tracing   Due to the recent outbreak of COVID-19, many governments suspended outdoor
activities and imposed social distancing policies to prevent the transmission
of SARS-CoV-2. These measures have had severe impact on the economy and
peoples' daily lives. An alternative to widespread lockdowns is effective
contact tracing during an outbreak's early stage. However, mathematical models
suggest that epidemic control for SARS-CoV-2 transmission with manual contact
tracing is implausible. To reduce the effort of contact tracing, many digital
contact tracing projects (e.g., PEPP-PT, DP-3T, TCN, BlueTrace, Google/Apple
Exposure Notification, and East/West Coast PACT) are being developed to
supplement manual contact tracing. However, digital contact tracing has drawn
scrutiny from privacy advocates, since governments or other parties may attempt
to use contact tracing protocols for mass surveillance. As a result, many
digital contact tracing projects build privacy-preserving mechanisms to limit
the amount of privacy-sensitive information leaked by the protocol. In this
paper, we examine how these architectures resist certain classes of attacks,
specifically DoS attacks, and present BlindSignedIDs, a privacy-preserving
digital contact tracing mechanism, which are verifiable ephemeral identifiers
to limit the effectiveness of MAC-compliant DoS attacks. In our evaluations, we
showed BlindSignedID can effectively deny bogus EphIDs, mitigating DoS attacks
on the local storage beyond 90% of stored EphIDs. Our example DoS attacks
showed that using 4 attackers can cause the gigabyte level DoS attacks within
normal working hours and days.

4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th