Various systems and methods of embedded authentication are described herein. One method of the preferred embodiment can include receiving at an authentication server a transaction token from a host website, the host website including an embeddable interface and prompting a user challenge by the authentication server at the embeddable interface. The method of the preferred embodiment can also include creating a signed authentication token in response to a successful user challenge, and transmitting the signed authentication token from the authentication server to the embeddable interface.