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Differential Privacy

Differential Privacy

1
posts
2023

Cloudflare is actively involved in standardizing and implementing privacy-preserving technologies. This includes contributing to the Distributed Aggregation Protocol (DAP) for private aggregation and enhancing it with differential privacy to provide a stronger guarantee against data leakage. The company is developing an open-source implementation of DAP and a service to support partners, aiming to protect user privacy in various applications like telemetry and exposure notification systems. The focus is on rigorously quantifying privacy guarantees through the epsilon parameter and ensuring graceful degradation of privacy under various attack scenarios.

2023

Have your data and hide it too: an introduction to differential privacy

12/22/2023

This post introduces differential privacy (DP) as a crucial enhancement to private aggregation techniques like DAP. It explains the limitations of DAP alone by demonstrating how aggregates can still reveal sensitive individual information through reconstruction attacks. DP is presented as a statistical framework that adds noise to aggregates, controlled by an epsilon parameter, to provide a rigorous mathematical guarantee of privacy. The post highlights the benefits of DP, including its generalizability across complex statistics, harmonization of security parameters, and graceful degradation of guarantees, contrasting it with ad-hoc privacy protections. It also mentions Cloudflare's role in standardizing DAP and developing an open-source implementation, with an intern tasked with devising a strategy to make DAP differentially private.