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Information Technology Journal
Year: 2010  |  Volume: 9  |  Issue: 3  |  Page No.: 446 - 452

Color Image Encryption Based on Secret Sharing and Iterations

Hao Luo, Fa-Xin Yu, Hui Li and Zheng-Liang Huang    

Abstract: This study proposes a novel simple scheme for color image encryption. The RGB color components of the input image are permuted and transformed into the YCbCr color space. Then three simultaneous equations are constructed for secret sharing of the luminance and two chrominance components. After several iterations, the output of this equation set is the encrypted content. These encrypted channels are recomposed to the encrypted image. In image decryption, we merely need to solve the simultaneous equation set based on Largrange’s interpolation with several inverse iterations. The decrypted image is of very high quality for only slight degradation is introduced due to the color space mapping. Security of our scheme is well preserved as long as the permutation key kept secret. Experimental results validate the effectiveness of the proposed method.

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