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Two-Level Blockchain System for Digital Crime Evidence Management.

Donghyo Kim1, Sun-Young Ihm2, Yunsik Son1

  • 1Department of Computer Science and Engineering, Dongguk University, Seoul 04620, Korea.

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|April 30, 2021
PubMed
Summary

This study introduces a two-level blockchain system to securely manage digital evidence in criminal investigations. It separates frequently changing data (hot blockchain) from static evidence like videos (cold blockchain) to improve performance and security.

Keywords:
blockchaincrime evidence managementdigital forensicsmart contract

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Area of Science:

  • Computer Science
  • Cybersecurity
  • Forensic Science

Background:

  • Digital evidence from sources like CCTV is crucial in criminal investigations but vulnerable when stored on physical drives.
  • Centralized systems for digital evidence management pose risks of data leaks if the server is compromised.
  • Current methods lack robust security and efficiency for managing large volumes of digital evidence.

Purpose of the Study:

  • To propose a novel two-level blockchain system for secure and efficient management of digital evidence.
  • To address the performance degradation issues associated with storing large data, like videos, on traditional blockchains.
  • To enhance the reliability and integrity of digital evidence throughout the criminal investigation process.

Main Methods:

  • Developed a two-level blockchain architecture separating digital evidence into 'hot' and 'cold' blockchains.
  • Implemented a system where frequently updated investigation information is stored on the hot blockchain.
  • Stored large, static digital evidence, such as video files, on the cold blockchain.

Main Results:

  • The proposed two-level blockchain system demonstrated improved storage and inquiry processing performance for digital crime evidence videos.
  • The separation of data types into hot and cold blockchains mitigated performance bottlenecks.
  • The system offers a more secure and distributed alternative to centralized digital evidence management.

Conclusions:

  • The two-level blockchain system provides a reliable solution for managing digital evidence and investigation information.
  • This approach enhances security by decentralizing data storage and mitigating risks associated with centralized servers.
  • The system shows potential for improving the efficiency and integrity of digital evidence handling in criminal justice.