diff --git a/.gitignore b/.gitignore
index 6c326e0..b449eea 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,14 @@ ui/*.tsbuildinfo
 ui/vite.config.js
 dist/
 .ace-tool/
+
+# Publisher signing material. `pluginsign` reads a raw 32-byte Ed25519 seed from a
+# file path, so a stray `seed.bin` in the working tree is one `git add -A` away from
+# being published. Never commit key material; keep seeds outside the repo.
+*.key
+*.pem
+*.seed
+seed
+seed.*
+*_seed
+*.bin