A method is disclosed. It includes displaying, by a device, an authentication image including a plurality of image elements comprising a set of image elements, wherein the image elements in the set of image elements are located at a set of positions on a display screen. The method also comprises receiving, at the device, a glyph having a configuration corresponding to the set of image elements from a user while the authentication image is displayed. The method further comprises determining if the glyph is authentic, and initiating a payment transaction after receiving the glyph.