Getting started
The metadata problem
Encryption hides content, not behaviour. What networks still reveal, and why it matters.
End-to-end encryption solved one problem very well: an observer can no longer read your messages. It did not stop the observer from learning almost everything else.
What still leaks
Every packet has to be delivered somewhere. To get it there, today's networks expose information that is never encrypted, because the infrastructure itself needs it.
| Signal | Visible to | What it reveals |
|---|---|---|
| IP addresses | ISPs, Wi-Fi operators, servers, transit networks | Rough location, organisation, household |
| Timing | Anyone on the path | When you are active and who responds to whom |
| Volume and size | Anyone on the path | Type of activity: a call, a file, a page load |
| Routes | Network operators | Which services and regions you talk to |
| Long-lived identifiers | Service operators | A single thread linking months of activity |
| Infrastructure relationships | Hosting and cloud providers | Which servers belong together and who runs them |
Why it matters
One piece of metadata is rarely sensitive. Collected over time it becomes a social graph, a daily schedule and a list of interests. That can be enough to identify a person without reading a single message.
- Correlation. Matching traffic that enters and leaves a network by timing and size links two ends of a conversation.
- Persistence. A fixed address or account ID turns separate sessions into one long history.
- Static infrastructure. Servers that never move can be found, mapped and watched once, then observed indefinitely.
Where existing tools stop
- Encrypted messengers
- Protect message content, but usually depend on central servers that see who is talking to whom and when.
- Conventional VPNs
- Move trust from your ISP to one provider. That provider sees everything, through a fixed server with a fixed address.
- Onion routing
- Strong path privacy, but relays are long-lived and publicly listed, which makes the network itself easier to map and observe.