Patent attributes
A network authentication device that includes an authentication engine in signal communication with a network interface. The authentication engine is configured to receive an authentication key request from a first user device that identifies an account linked with a first user and a second user device. The authentication engine is configured to generate an authentication key and to establish a first set of authentication rules for the first user and a second set of authentication rules for the second user. The authentication engine is configured to generate a first authentication key fragment comprising a first portion of the authentication key and a second authentication key fragment comprising a second portion of the authentication key and to send the first authentication key fragment to the first user device and the second authentication key fragment to the second user device.