1. A method of authenticating images, the method comprising: electronically receiving an anchor image and a query image; performing a feature point extraction of an anchor image; performing a feature point extraction of a query image; clustering feature points of the anchor image and feature points of the query image, clustering comprising determining matching feature points, determining outlier feature points, and excluding outlier feature points; determining whether the anchor image is similar to the query image based on a distance between the feature points of the anchor image and the feature points of the query image; and if the anchor image is similar to the query image based on the determining, identifying possible tampered areas of the query image based on the outlier feature points.