Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blockchain Driven Privacy Preserving Contact Tracing Framework in
  COVID-19   Contact tracing has been proven an effective approach to mitigate the virus
spread in pandemics like COVID-19. As an emerging powerful decentralized data
sharing and storage technique, blockchain has been explored to ensure data
privacy and security in contact tracing processes. Existing work mostly treats
blockchain as a separate storage system requiring third-party servers to
perform data collection and computation, and avoids revealing detailed interior
design of blockchain storage. However, blockchain system is capable to work as
a fully automatic distributed contact tracing system without any third-party
server by tackling the following challenges: 1) how to ensure the contact
tracing correctness without compromising privacy; 2) how to design efficient
and effective consensus mechanism to ensure the system security and robustness;
3) how to design an incentive mechanism to motivate people to behave honestly.
In this article, we present the Blockchain Based Contact Tracing Framework for
the contact tracing problem. In the framework, RSA encryption based transaction
verification algorithm (RSA-TVA) is proposed to ensure contact tracing
correctness, which can achieve more than 97% contact case recording accuracy
even when each person has 60% chance of failing to verify the contact
information. Reputation Corrected Delegated Proof of Stack (RC-DPoS) consensus
mechanism is applied to jointly work with the proposed incentive mechanism,
which can ensure timeliness of reporting contact cases and meanwhile balance
the reward gained by different people. A novel contact tracing simulation
environment is created in the simulation part, which considers three different
contact scenarios. The simulation results demonstrate the effectiveness,
robustness and attack resistance of RSA-TVA and RC-DPoS in the proposed
Blockchain Based Contact Tracing Framework.

17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
16
The categories of this paper are: stat