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PrivacyGuard: Enforcing Privacy Data Usage with Blockchain and Attested Execution

1. Introduction

This contextual nature of privacy implies that privacy protection techniques need to address at least two aspects:

  1. what kind of information can be exposed to whom, under what conditions
  2. what is the "intended purpose" or "expected use" of this information

Related work focus on :

  • data access control
  • data anonymization

Only recently, there have been a few works that attempted to address the second aspect of privacy, i.e., data used only for the intended purposes.1

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In PrivacyGuard, smart contracts are used to facilitate the transactions of private data utilization on the private data market, providing access control, tamper-resistent record of data utilization.

2. Overview

  • Confidentiality Protection on User Data
  • Verifiable User-controlled Fine-grained Data Access
  • Provable Legal Binding on User Data Usage

  1. Decentralizing privacy: Using blockchain to protect personal data. In Security and Privacy Workshops (SPW). IEEE, 2015. ↩