We’re the Electronic Frontier Foundation, an independent non-profit working to protect online privacy for over thirty years. This is Surveillance Self-Defense: our expert guide to protecting you and your friends from online spying.
Read the BASICS to find out how online surveillance works. Dive into our TOOL GUIDES for instructions to installing our pick of the best, most secure applications. We have more detailed information in our FURTHER LEARNING sections. If you’d like a guided tour, look for our list of common SECURITY SCENARIOS.
Popular Guides
See All GuidesBasics
- 保护数据安全
- 关于加密,我应该了解什么?
- 创建安全性强的密码
- 制定安全计划
- 数字安全的七个注意事项
- Animated Overview: How to Make a Super-Secure Password Using Dice
- Animated Overview: How Strong Encryption Can Help Avoid Online Surveillance
- Choosing Your Tools
- Why Communication Metadata Matters
- Animated Overview: Using Password Managers to Stay Safe Online
- Animated Overview: Protecting Your Device From Hackers
- Communicating With Others
Tool Guides
- 如何使用 Signal
- 如何使用 WhatsApp
- 如何加密 iPhone
- 如何加密 Windows、Mac 或 Linux 电脑
- 如何启用双因素认证
- 如何在安卓和 iPhone 手机上使用 Tor
- 操作指南:全面掌握 iPhone 隐私与安全设置
- 操作指南:全面掌握安卓隐私与安全设置
- How to: Delete your Data Securely on Linux
- How to: Delete Your Data Securely on Windows
- How to: Delete Your Data Securely on macOS
- How to: Understand and Circumvent Network Censorship
- How to: Use Tor
- How to: Enable Lockdown Mode on iPhone
- How to: Avoid Phishing Attacks
- How to: Detect Bluetooth Trackers