A Simple, Accurate and Highly Secure Method to Encrypt-Decrypt Digital Images

Abstract

The digital image may be important and has a secret character, which requires not understanding it when looking at the naked eye or not understanding the contents. So seeking a method of digital image encryption-decryption is a very important task. In this paper we will introduce a new method of digital image encryption-decryption, which will be very simple, highly secure and accurate and highly efficient.

Window Median Filter (WMF) to Eliminate Salt and Pepper Noise from Digital Color Image

“…Each pixel in the noise-affected image is processed depending on the median value as shown in the figure 6 and on the average values as shown in the figure 7. The quality of the filtered image can be calculated using mean square error (MSE) or peak signal to noise ratio (PSNR), the lower the value of MSE is, the better the quality of the de-noised image, while the higher the value of PSNR is, the better the quality of the de-noised image [19], [20], [27]. MSE and PSNR can be calculated using equations 1 and 2 [15][16][17]:…”

“…The SAPN noise of the digital color image leads to an increase in the number of repetitions of each of the zero and 255 in each of the three colors, and this can be seen in the image color histograms as shown in figures 2 and 3 [12][13][14][15][16]. The noise in the digital color image is processed by processing the matrix of each color separately [17][18][19][20], and after processing the noise in each color [14], the colors are recombined in one matrix to form the filtered color image, as shown in the figure 4. The proposed method for eliminating SAPN is based on generating a window used to calculate the pixel value in the matrix in which noise is to be processed.…”

Using Logical Operations to Secure LSB2 Data Steganography

“…-High quality factors, minimizing mean square error (MSE) [12], [13], [14], and maximizing peak signal to noise ratio (PSNR) [15], [16] between the carrier image and the stego_image.…”

Developing new Multilevel security algorithm for data encryption-decryption (MLS_ED)

“…Data cryptography means encrypting and decrypting data using a selected tool or method, encrypting the data means destroying the data to make it impossible to be understood or used by any other unauthorized party [1], [2].…”