Advanced security (#2)

* Advanced security header layer & config

device/util.go

@@ -0,0 +1,25 @@
+package device
+
+import (
+	"bytes"
+	crand "crypto/rand"
+	"fmt"
+)
+
+func appendJunk(writer *bytes.Buffer, size int) error {
+	headerJunk, err := randomJunkWithSize(size)
+	if err != nil {
+		return fmt.Errorf("failed to create header junk: %v", err)
+	}
+	_, err = writer.Write(headerJunk)
+	if err != nil {
+		return fmt.Errorf("failed to write header junk: %v", err)
+	}
+	return nil
+}
+
+func randomJunkWithSize(size int) ([]byte, error) {
+	junk := make([]byte, size)
+	_, err := crand.Read(junk)
+	return junk, err
+}