1. A method of reading watermarking information embedded in a marked object that is also protected by a network of guilloches, the method comprising: capturing a picture of the object, analyzing the network of guilloches, extracting all or part of the points of intersection between guilloches, called candidate points, loading a set of reference points, graphically synchronizing a support using the reference points and the candidate points, loading a MASK value, applying the MASK value to recreate a sub-group, applying an invariable triangulation algorithm, and looking for, in all or part of the triangle thus obtained, the watermarking information.