Adjusting the position of an endpoint reference for increasing security during device log-on

1. One or more non-transitory computer readable media having computer readable instructions stored thereon for authenticating a user of a computing device, the computing device having a memory storing a base image and an overlay image, the base image having a base image reference point, and the overlay image having an overlay image reference point, which when executed by a processor direct the computing device to:

generating a modified base image;

generating a modified overlay image;

displaying, on a display, the modified base image overlaid by the modified overlay image, wherein displaying includes varying at least one of a position of the base image reference point on the display and a position of the overlay image reference point on the display relative to a previous displaying of the base image and the overlay image;

receiving an input causing alignment of the base image reference point on the modified base image with the overlay image reference point on the modified overlay image at a point on the display; and

in response to the alignment, indicating positive authentication.

2. The non-transitory computer readable media of claim 1 , wherein generating the modified base image comprises making a copy of the base image.

3. The non-transitory computer readable media of claim 1 , wherein generating the modified overlay image comprises making a copy of the overlay image.

4. The non-transitory computer readable media of claim 1 , wherein generating the modified base image comprises randomly altering the position of the base image reference point on the display.

5. The non-transitory computer readable media of claim 1 , wherein the input comprises a movement of the modified base image and a movement of the modified overlay image.

6. The non-transitory computer readable media of claim 1 , wherein the input comprises a sequence of movements of the modified base image and the modified overlay image.

7. The non-transitory computer readable media of claim 1 , wherein generating the modified base image comprises randomly altering an appearance of the base image.

8. The non-transitory computer readable media of claim 1 , wherein generating the modified base image comprises distorting the base image.

9. The non-transitory computer readable media of claim 1 , wherein generating the modified overlay image comprises randomly altering the appearance of the overlay image.

10. The non-transitory computer readable media of claim 1 , wherein the overlay image is a grid of images and generating the modified overlay image comprises altering the position of the overlay image reference point while maintaining at least one of a column and a row with images having a common characteristic.

11. A method of authenticating a user of a computing device, the computing device having a memory storing a base image and an overlay image, the base image having a base image reference point, and the overlay image having an overlay image reference point, the method comprising:

generating a modified base image;

generating a modified overlay image;

displaying, on a display, the modified base image overlaid by the modified overlay image, wherein displaying includes varying at least one of a position of the base image reference point on the display and a position of the overlay image reference point on the display relative to a previous displaying of the base image and the overlay image;

receiving an input causing alignment of the base image reference point on the modified base image with the overlay image reference point on the modified overlay image at a point on the display; and

in response to the alignment, indicating positive authentication.

12. The method of claim 11 , wherein generating the modified base image comprises randomly altering an appearance of the base image.

13. The method of claim 11 , wherein generating the modified overlay image comprises randomly altering an appearance of the overlay image.

14. A computing device comprising:

a processor;

a display;

a user interface for receiving user input; and

one or more non-transitory computer readable media having computer readable instructions stored thereon for authenticating a user of the computing device, the computing device having a memory storing a base image and an overlay image, the base image having a base image reference point, and the overlay image having an overlay image reference point, which when executed by the processor direct the computing device to generate a modified base image; generate a modified overlay image;

display, on the display, the modified base image overlaid by the modified overlay image, wherein including varying at least one of a position of the base image reference point on the display and a position of the overlay image reference point on the display relative to a previous display of the base image and the overlay image; receive an input causing alignment of the base image reference point on the modified base image with the overlay image reference point on the modified overlay image at a point on the display; and in response to the alignment, indicate positive authentication.

15. The computing device of claim 14 , further comprising the memory.

16. The computing device of claim 14 , wherein the non-transitory computer readable media comprises a flash memory.

17. The computing device of claim 14 , wherein the user interface comprises a touch screen.

18. The computing device of claim 14 , comprising a mobile electronic device.