We’re the Electronic Frontier Foundation, a member-supported non-profit working to protect online privacy for over thirty-five 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.