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DIMY: Enabling privacy-preserving contact tracing.

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A new blockchain-based protocol, "Did I Meet You" (DIMY), enhances digital contact tracing by prioritizing user privacy and security. This method offers efficient, privacy-preserving storage and secret sharing, reducing adoption barriers for COVID-19 contact tracing apps.

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BlockchainBloom filterCOVID-19Contact tracingPrivacySecurity

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Area of Science:

  • Computer Science
  • Cybersecurity
  • Public Health

Background:

  • The COVID-19 pandemic necessitated rapid spread reduction strategies, including digital contact tracing.
  • Existing digital contact tracing apps face low adoption rates due to significant privacy and security concerns.
  • Traditional manual contact tracing is labor-intensive and less scalable in widespread outbreaks.

Purpose of the Study:

  • To introduce a novel blockchain-based protocol for privacy-preserving digital contact tracing.
  • To address and mitigate privacy and security apprehensions associated with current contact tracing technologies.
  • To develop a solution with efficient data handling and minimal resource overhead.

Main Methods:

  • Implementation of a blockchain-based protocol named "Did I Meet You" (DIMY).
  • Utilization of Bloom filters for efficient, privacy-preserving data storage.
  • Employment of Diffie-Hellman key exchange for secure secret sharing among participants.

Main Results:

  • DIMY ensures full-lifecycle data privacy protection on both client devices and back-end servers.
  • The protocol demonstrates resilience against numerous known security attacks.
  • DIMY exhibits significantly lower storage footprint on devices and servers compared to existing solutions.

Conclusions:

  • The DIMY protocol effectively enhances privacy and security in digital contact tracing.
  • Blockchain technology, combined with Bloom filters and Diffie-Hellman exchange, offers a viable solution to adoption barriers.
  • DIMY presents a scalable and efficient alternative for public health initiatives requiring contact tracing.