A method for authenticating an individual for login to a server computer includes receiving at the server computer data for a first authentication image from an electronic computing device. First attributes are identified of one or more similar geometrical shapes from the data for the first authentication image. A determination is made as to whether the first attributes of the one or more similar geometrical shapes from the data for the first authentication image correspond to second attributes from a second authentication image accessible on or by the server computer. When the first attributes correspond to the second attributes, the individual is authenticated on the server computer.