Abstract: A method of securing a computer resource against unauthorized access by a user computer system attempting to access the computer resource includes sending, by a processing device, a challenge data structure to the user computer system. The challenge data structure defines a challenge to be presented to a user of the user computer system. The challenge includes a user interface for manipulating one or more objects to match a defined alignment. The method further includes obtaining a user input to the user interface that represents a manipulation of the one or more objects to a first orientation and providing access to the computer resource for the user computer system based on whether the first orientation of the one or more objects matches the defined alignment.

Abstract: A method of securing a computer resource against unauthorized access includes sending, by a processing device, a challenge data structure to a user computer system, obtaining a user response representing at least one user-selected image from the plurality of images, and providing access to the computer resource for the user computer system based on whether the at least one user-selected image is consistent with the one or more correct images. The challenge data structure defines a challenge to be presented to a user of the user computer system. The challenge involves selecting one or more correct images that conform to one or more aspects of a challenge key from a plurality of images based on a relative orientation with respect to one another of elements within the plurality of images.