security: replace personal email with confidential issue reporting

SECURITY.md

@@ -1 +1,26 @@
-If you find a security issue, report it privately by emailing blankie@tuta.com. Please don't file a public issue.
+# Security Policy
+
+TinyWeb is a self-hosted personal search engine with no authentication. It is
+bound to localhost by default. Do not expose it to the internet without a
+reverse proxy with authentication.
+
+## Supported Versions
+
+Security fixes are handled on the default branch.
+
+## Deployment Guidance
+
+- Keep TinyWeb bound to `127.0.0.1` unless you need LAN access
+- If binding to `0.0.0.0`, put a reverse proxy with auth in front (Caddy, nginx)
+- Always use HTTPS when exposing beyond localhost
+- Protect `~/.tinyweb/tinyweb_identity` — losing it changes your destination hash
+- Protect `~/.tinyweb/index.db` — contains your full browsing history
+- Never commit `*.db`, `tinyweb_identity`, `.env`, or `models/` to version control
+- Keep `--bind 0.0.0.0` usage to trusted networks only
+- The bookmarklet token is sent as a plain URL parameter — treat it as a secret
+- Forum plugin: moderation is gossip-based; block lists can be manipulated
+
+## Reporting
+
+Report vulnerabilities privately by creating a confidential issue on the
+repository. Do not file a public issue until the report has been acknowledged.