The Digital Security Digest, by Freedom of the Press Foundation (FPF), is a weekly newsletter with security tips that keep you, your sources, and your devices safe. If someone shared this newsletter with you, please subscribe here. WhatsApp, owned by Meta, is the largest messaging app in the world to offer end-to-end encryption by default. But it has a meaningful privacy trade-off: You have to use your phone number to communicate with others on the app.