US Patent 11645377 Online authentication and security management using device-based identification

Techniques are disclosed to provide enhanced online security. A network server actively monitors data between a network server hosting a website and a computing device. Some of the disclosed techniques leverage “cookie stitchers” to associate user data, which may include a website identifier, to the user's computing devices. These techniques allow the network server to block access to explicitly identified computing devices, or to trigger two-factor authentication.