MultiInfHidingSys.DVI Mathematical Problems of Computer Science 24, 2005, 89{103. On I nfor mation H iding System With M ultiple M essages¤ Ma r ia m E . H a r o u t u n ia n a n d S m b a t A . To n o ya n Institue for Informatics and Automation Problems of NAS of RA e-mail armar@ipia.sci.am, smbatt@ipia.sci.am Abstract Many algorithms and schemes of multiple watermarking, ¯ngerprinting and multi- media data creation are implementing to hide more than one watermark. Information theoretical analysis of information hiding system with multiple messages is considered in this paper. The rate-reliability-distortion function (which we call the information hiding E-capacity [5, 9]) for this system, in case of two messages (watermarks) is in- vestigated. The inner bounds for information hiding E-capacity and for information hiding capacity [1] regions are constructed. Refer ences [1 ] P . Mo u lin a n d J. A . 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