Provided is a process, including: receiving a request to authenticate a user to access resources from a first computing device; in response to receiving the request, sending, with one or more processors, instructions that cause the first computing device to display a machine readable image, wherein: the machine readable image is configured to, upon being sensed with a camera of a second computing device, cause the second computing device to present, with a display of the second computing device, a user interface with a user-credential input configured based on the machine readable image displayed by the first computing device; receiving from the second computing device, a value demonstrating possession of a user credential and an identifier of the second computing device, the user credential being entered into the second computing device via the user interface configured based on the machine readable image displayed by the first computing device.