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A Distributed Oracle Using Intel SGX for Blockchain-Based IoT Applications.

Sangyeon Woo¹, Jeho Song¹, Sungyong Park¹

¹Department of Computer Science and Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Korea.

Sensors (Basel, Switzerland)

|May 14, 2020

Summary

This summary is machine-generated.

This study introduces a distributed blockchain oracle solution using Intel SGX to enhance data availability and integrity. A novel reputation system minimizes response times, even with malicious servers, improving oracle performance.

Keywords:

Internet of Things blockchain blockchain oracle ethereum smart contracts

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Area of Science:

Computer Science
Cryptography
Distributed Systems

Background:

The blockchain oracle problem concerns securely integrating external data into blockchains.
Existing solutions often lack robust data availability or integrity guarantees.
Minimizing oracle response times, especially under malicious or overloaded conditions, remains a challenge.

Purpose of the Study:

To propose a novel distributed oracle system addressing limitations in current solutions.
To enhance data availability and integrity for blockchain oracles.
To minimize average response times, even in adversarial scenarios.

Main Methods:

Implementation of a distributed oracle leveraging Intel Software Guard Extensions (SGX).
Utilization of multiple oracle servers for data availability.
Integration of Intel SGX and Transport Layer Security (TLS) for data integrity.
Development of a reputation system prioritizing faster response times.

Main Results:

The proposed system demonstrates strong data availability and integrity.
Benchmarking shows a response time increase of only 14% compared to centralized oracles with 3 servers.
The system scales effectively, maintaining performance with up to 9 oracle servers.
The reputation system proved feasible and effective in experiments.

Conclusions:

The proposed distributed oracle with Intel SGX offers a secure and efficient solution to the oracle problem.
The system effectively balances data integrity, availability, and minimized response times.
The reputation mechanism enhances resilience against malicious or overloaded oracle servers.