I developed Chrome extension that is fingerprinting Drupal websites.
If you going to secure exact version of Drupal engine
then use free extension https://chrome.google.com/webstore/detail/drupal-validate-check-ver/lafmafacfnblkahhfflblanbdmpkdoid
If the version is determined then you neew to hide everything that can let extension know the version and hide it.
I will be very appreciated if you can leave your feedback.