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In recent years, characterized by the innovation of technology and thedigital revolution, the field of media has become important. The transfer andexchange of multimedia data and duplication have become major concerns ofresearchers. Consequently, protecting copyrights and ensuring service safety isneeded. Cryptography has a specific role, is to protect secret files againstunauthorized access. In this paper, a hierarchical cryptosystem algorithm basedon Logistic Map chaotic systems is proposed. The results show that the proposedmethod improves the security of the image. Experimental results on a databaseof 200 medical images show that the proposed method significantly gives betterresults.

A new Watermarking Technique for Medical Image using Hierarchical Encryption