Description
HTTP Strict Transport Security (HSTS) is an essential security mechanism designed to enforce secure HTTPS connections between web browsers and servers. In essence, HSTS instructs browsers to communicate with a site exclusively over HTTPS, reducing the risk of certain cyberattacks such as man-in-the-middle and SSL stripping. Understanding the basics of HSTS and its role in web security helps users better protect their online activities.
Recommended Actions
Enabling HSTS on web servers requires specific configuration steps tailored to your environment. Whether you use Apache, Nginx, IIS, or another platform, implementing HSTS usually involves adjusting server settings to include the appropriate HSTS directives. In addition, sites can further enhance security by submitting to the HSTS preload list to ensure browsers enforce HSTS for their domains by default.
Example:
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
max-age=31536000: Specifies the number of seconds the browser should remember the HSTS policy. In this example, it’s one year (60 seconds × 60 minutes × 24 hours × 365 days).includeSubDomains: Indicates that the HSTS policy also applies to all subdomains of the current domain.preload: Signals that the site should be included in browsers’ HSTS preload list, meaning the policy is applied by default even for first-time visitors.
This header ensures that all connections to the site and its subdomains use HTTPS for one year and that the site is eligible for the HSTS preload list for additional protection.
