Patent ID: 7562385

Claim:
A method of dynamic authentication of a guest device by an authentication system, the guest device being in communication with a user device controlled by a user, the method at the authentication system comprising: storing a first set of associations between users, user devices and physical keys; receiving, over a first communications channel, a proposed dynamic association between the guest device and a physical key based on presence of the physical key at or near the guest device; determining the user device corresponding to the physical key based on the first set of associations; receiving, over a second communication channel, a user confirmation of the proposed dynamic association from the user device; and authenticating the guest device based on the proposed dynamic association, the user confirmation, and the first set of associations for access to at least one of: information and services associated with the user of the user device, wherein the proposed dynamic association and information received by the guest device exclude information required for completing the authenticating of the guest device.