A system for facilitating authentication of a user based on a polygonal image includes a registration module registering a user by selecting a password artifact comprising a first polygon and a first image from a set of images. The first polygon includes a plurality of grids. The registration module slices the first image to derive a set of sub first images based on the grids and derives a first image pattern by aligning a sub image on each of the grids in accordance with a preference defined by the user. The authentication module authenticates the user by displaying a plurality of password artifacts comprising a plurality of polygons and a plurality of images and derives a second image pattern upon aligning a sub image of a set of sub second images, created by slicing a second image, on each of a plurality of grids associated to the second polygon.