Method of forming a digital watermark for physical and electronic documents

In this paper we proposed a universal method for forming the watermark for both physical and electronic documents. Such a watermark can be used for authentication of documents, as well as for secure communication. For both cases we described the procedure for exchange of information between two parties. The analysis of the complexity of detecting the presence of the watermark and extracting the embedded information by a third party was performed, and it showed operabil-ity of the proposed method.