HSTSpäätekijään
HSTSpäätekijän is a term of Finnish origin that translates roughly to "HSTS main factor" or "HSTS key factor." In the context of web security, HSTS stands for HTTP Strict Transport Security. HSTS is a web security policy mechanism that helps protect websites against protocol downgrade attacks and cookie hijacking. It allows a web server to declare to the user agent, via a specific HTTP header, that it should only interact with the server using secure HTTPS connections.
The "päätekijän" aspect of HSTSpäätekijän refers to the critical element or component that drives the effectiveness