How does authentication with tokens work?

Question

User identification

Good afternoon.
Tell me, where can I find out how authorization for web applications using tokens works? And how to organize it. Preferably in Russian.
Google stubbornly shows usb tokens. But this is a little different. It is necessary concerning a web.

Answer 1

www.rutoken.ru/products/all/rutoken-web
the "Description" section
and
www.rutoken.ru/products/all/rutoken-plugin
the "Developer" section of the
SDK, as far as I understand, is open.
I myself did not use these solutions, but I heard that they are actively used.