Focus-based challenge-response authentication

摘要

A method for authenticating an access attempt includes detecting an access attempt by a user device over a network. A challenge-response authentication is provided over the network to the user device. The challenge-response authentication includes an image having a plurality of image objects. The challenge-response authentication is operable to display the image such that at least one of the plurality of image objects is in focus and at least one of the plurality of image objects is not in focus. In response to providing the challenge-response authentication, an authentication response is received from the user device over the network, and it is determined whether the authentication response includes an indication of the at least one of the plurality of image objects that is in focus to determine whether to authenticate or deny the access attempt.

主权项

1. A method for authenticating an access attempt, comprising:
detecting an access attempt by a user device over a network; providing a challenge-response authentication over the network to the user device, wherein the challenge-response authentication includes a multi-focal-point image having a first image object associated with a first focal point in the multi-focal-point image, a second image object associated with a second focal point in the multi-focal-point image that is different from the first focal point, and depth information associated with the first image object and the second image object, and wherein the challenge-response authentication is configured to display the multi-focal-point image and use the depth information to change a focus of the multi-focal point image between the first focal point and the second focal point; receiving, in response to providing the challenge-response authentication, an authentication response from the user device over the network; and determining whether the authentication response includes an indication of or information about the first image object when the first focal point is focused or the second image object when the second focal point is focused.