Information security is very important task in the field of information and communication technology. Encryption is one way to secure information. In this paper we present combined concept of pixel and position manipulation technique for image encryption. The proposed technique involves three stages. In first stage pixel position manipulation is done by using pixel shuffling block where index value of each row is rearranged in bit-reversed order so that the positions of rows are manipulated. Similarly index value of each column is rearranged in bit-reversed order, which leads to manipulation of columns. This position manipulated image is used as input to the pixel manipulation block in second stage, where each pixel is rearranged in reverse order. In third stage, this scrambled image is again undergone pixel value manipulation by using bit-rotation concept leading to encrypted image. This proposed combined concept is implemented for different images using MATLAB. Decryption involves the reverse process of encryption.

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Pixel Manipulation Position Manipulation Bit-reversal Bit-rotate Encryption