diff --git a/pkg/packet.lua.d/rand.go b/pkg/packet.lua.d/rand.go
new file mode 100644
index 0000000..61200ee
--- /dev/null
+++ b/pkg/packet.lua.d/rand.go
@@ -0,0 +1,13 @@
+package packet
+
+import "math/rand"
+
+const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$%!@%&*()-=+[]{}:;.,1234567890"
+
+func randStringBytes(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return string(b)
+}