cypurr.org

slides.com/cypurr/2025-07-browsing

7/19/2025

Exp 7/19/2026

Agenda

• Intros

• What Browsing Shares

• Guests

  • Privacy Badger

  • Risk Mitigation

• Q&A (end stream)

• Tool-a-palooza

Who are we? Who are you?

We are …

    The Cypurr Collective

Beginner-friendly cybersecurity events with a holistic approach. Teaching to build community self-defense

Security is scary, let’s be gentle.

Step up; Step Back

Privacy:

• We’re in public! Keep it general

Safer space workshop

We DO NOT tolerate language or behavior meant to demean or harm folks based on their identity

• Journalists, Researchers, etc make yourselves known!

✅

❌

What's something you  do for a private search?

Introduce Yourself

• What do I want to protect? Assets
• Who are my allies/adversaries?
• How can things go wrong? Capabilities
• How likely are these threats? Risk
• How much trouble will I go through? Effort

Security Planning (recap)

https://ssd.eff.org/module/your-security-plan

What Browsing Shares

aka a tiny overview of many ways you unwittingly share more information than you intend when you're browsing the internet for fun or for work

On Device

Browser

Internet Connection

Online Services

Aggregators

On Device

On Device

Browser

Internet Connection

Online Services

Aggregators

• Other Users
• Operating system
  • .
  • Security
  • App Permissions
• Other Apps
  • VPN/TOR etc
  • Spyware/Malware
  • AI
  • Instagram!

Browser

On Device

Browser

Internet Connection

Online Services

Aggregators

What is a "browser"?

- More than you think!

- Info shared

 - Info received

 - How things run

  - Encryption

  - Permissions

Perks:

• You have a choice
• You have control (extensions)
• often more neutral than apps

Internet Connection

On Device

Browser

Internet Connection

Online Services

Aggregators

Intermediaries

- Many

  - local network, ISPs , DNS, etc

- Content & Metadata

  - Encryption, post card v. envelope

- (maybe) VPN/TOR

 - Envelopes in Envelopes

Online Services

On Device

Browser

Internet Connection

Online Services

Aggregators

Services you want

• Website, e.g., Facebook
  • Login
  • Collected info
  • Stored info
  • Code
• Settings help!
  • dark patterns don't

Services they told you not to worry about

• "3rd parties" run on sites
  • CDNs, "sign in with"
  • trackers!

Aggregators

On Device

Browser

Internet Connection

Online Services

Aggregators

Data Brokers

  - Gathers and sells

Law Enforcement

  - Legal demands

  - Social media monitoring

  - Data brokers!

Other Attackers

  - OSINT/doxxing

  - Data leaks

Guests

EFF's Daly Barnett and Alexei

10m Stretch

Let's install PB

Note: On mobile, only FF + Android

1. https://privacybadger.org/
2. "Add to [your browser] "
3. "Add" (optional, private browsing)

Using PB

Something off?

1. Click PB
2. "Disable for this site"
3. Consider reporting

Thanks!

Find us on cypurr.org

Ask about our email list

• Further Resources

  • CryptoParty Harlem

  • EFF (esp ssd.eff.org)

  • Freedom of the Press Foundation (Freedom.press)

Upcoming

TOMORROW:

Screening of The Net

Wonderville bar @2pm

Brooklyn Public Library (September)

And more! check out our social media or email list

Thanks!