iThemes Security Pro 8.4.2

Bug Fix: Fixed an infinite loop that could occur when expiring a cookie and Hide Backend is enabled.
Bug Fix: Fixed compatibility issue with the Jetpack plugin when Hide Backend is enabled which could prevent Jetpack from redirecting users to the wordpress.com login page.
Bug Fix: Fixed issue where access to wp-admin/admin-post.php when Hide Backend is enabled.
Enhancement: Centralized shared code used by Password Expiration, Two-Factor Authentication, and User Security Check.
Enhancement: Improved efficiency of Hide Backend code, increasing site performance when the feature is enabled.
Enhancement: Enforce strong passwords during log-in. Can be disabled via the ITSEC_DISABLE_PASSWORD_REQUIREMENTS constant.
Enhancement: Use canonical roles library to determine if a new user or an updated role requires a strong password.
Enhancement: Introduce password requirements module to centralize handling of password updates.
Misc: Updated Disable File Locking description.

New Feature: Added support for iThemes Sync to import and export settings.

New Feature: Added support for iThemes Sync to run the Security Check feature from inside the Sync service.
Bug Fix: Fixed the ability to manually enter a page number to navigate to on the Security > Logs page.
Bug Fix: Fixed source of warning that could appear when creating a backup while running a PHP version less than 5.4.
Bug Fix: Fixed source of notice that could appear when reseting a user's password when the Strong Passwords Enforcement feature is enabled.
Bug Fix: Fixed bugs that prevented reporting of specific error messages related to updating the wp-config.php file.
Misc : Updated or added phpDoc to many functions.