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update(blog)!: Privacy-Enhancing Technologies Series: Differential Privacy

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---
date:
created: 2025-07-01T17:30:00Z
categories:
- Explainers
authors:
- fria
tags:
- Privacy Enhancing Technologies
- Differential Privacy
license: BY-SA
schema_type: BackgroundNewsArticle
description: |
Privacy Pass is a new way to privately authenticate with a service. Let's look at how it could change the way we use services.
---
# Privacy-Enhancing Technologies Series: Differential Privacy
Is it possible to collect data from a large group of people but protect each individual's privacy? In this entry of my series on privacy-enhancing technologies, we'll discuss differential privacy and how it can do just that.<!-- more -->
## Problem
It's useful to collect data from a large group of people. You can see trends in a population. But it requires a lot of individual people to give up personally identifiable information. Even things that seem inocuous like your gender can help identify you. 87% of Americans can be identified by three pieces of information:
## History
Most of the concepts I write about seem to come from the 70's and 80's, but differential privacy is a relatively new concept. It was first introduced in a paper from 2006 called [*Calibrating Noise to Sensitivity in Private Data Analysis*](https://desfontain.es/PDFs/PhD/CalibratingNoiseToSensitivityInPrivateDataAnalysis.pdf)