Abstract:
In this research, a new modified version of Tree Dimension Playfair (3D-Playfair) cipher algorithm is introduce to encrypt image. The new method is create (16 X 4 X 4) matrix based on the key being entered by the user to become more secretive, and then manipulate image data the algorithm work on trigraph rather than using digraph, and to increasing complexity of the algorithm the key is used to generate a mask that is subsequently Exclusive OR (XORed) with the scrambled image after encrypt it.
The experimental results showed that the key space of the proposed technique makes it hard for the attacker to perform a frequency analysis based on the used pixel trigraph. Furthermore, further tests showed that a small change in the key value results in completely different cipher images. Peak Signal-to-Noise Ratio (PSNR) values and histogram comparisons were also deployed to show the robustness of the proposed cipher
