Like Drupal. But "hardened" with additional modules/configuration to try to make it more secure (or at least to match common conceptions about how to make something secure).
This project comes with the same warranty as all other projects on Drupal.org.
A full drupal install is available below.
If you are comfortable with drush make the make file build-hardened_drupal.make can be used to build Hardened Drupal with the command:
drush make build-hardened_drupal.make hardened_drupal