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the bits of the encrypted data. In (12), a method based on the chaotic model has been used. In this method, each bit of the encrypted data is hidden in the least valuable bit of a pixel of the image the position of which is determined by the chaotic model. In (13) also, a method has been introduced which is based on the histogram of the image; and in which the highest and the lowest frequency of the gray surfaces in the image are employed for hiding the bits of the encrypted data. The major difficulties in most of these presented methods can be studied under two headings: (a) the unbalanced distribution of the bits of the encrypted data on the surface of the cover image, and (b) the reduction in the hiding capacity In this paper, a new method is introduced in which the chaotic model and the histogram of the image are used. The chaotic feature of the signals of the chaotic model has been extensively used in topics related toimage processing, while it has not been used much in the context of hiding information. In the method proposed in this article, the histogram of the image is employed for finding the gray surfaces of the pixels of the cover image, each of which pixels covers one bit of the encrypted data. This greatly enhances the capacity for hiding information. On the other hand, the main duty of the chaotic model is the balanced distribution of the bits of

A Novel Data Hiding Method by Using Chaotic Map and Histogram