Prof. Ziad Alqadi, International Journal of Computer Science and Mobile Computing, Vol.9 Issue.11, November- 2020, pg. 21-27 © 2020, IJCSMC All Rights Reserved 21 Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320–088X IMPACT FACTOR: 7.056 IJCSMC, Vol. 9, Issue. 11, November 2020, pg.21 – 27 Image Blocking to Hide Secret Message Prof. Ziad Alqadi Faculty of Engineering Technology, Computer Engineering Albalqa Applied University, Jordan Amman DOI: 10.47760/ijcsmc.2020.v09i11.002 Abstract: A huge number of messages circulate through social media, and many of these messages are confidential or carry personal information, which requires protection from intruders. The least significant bit method of data steganography is effective in masking messages, but it is not secure. In this research paper we will present a way to raise the security of the method of hiding messages without affecting the effectiveness of the method by keeping the MSE values low and PSNR values high. The proposed method will base on extracting a secret block from the image, this block will be used as a covering media to hold the secret message, after inserting the secret message the block will be returned back to the covering image. Keywords: Steganography, covering image, holding image, block, LSB, MSE, PSNR. 1- Introduction The process of hiding secret or private messages is extremely important [5], [6]. And to implement the process of hiding messages, colored digital images can be used as a medium to hide messages for various reasons, the most important of which are [7]. [8], [9]:  Color images are a massive medium due to the high resolution of the color image [16],[17], 18].  Color image is widely available and can be obtained easily [19], [20].  Ease of processing color digital image [21-32].  The ability to use a specific part of the image to hide the message. An effective way to hide secret messages by using color images as carrier images must be characterized by the following: Not to influence the image much so that the differences between the original image and the carrier image are not noticed with the naked eye, as shown in Figure 1. The mean square error (MSE) [10], [11], [12] between the original image and the carrier one must very closed to zero. The peak signal to noise ratio (PSNR) [13], [14], [15] between the original image and the carrier one must very high.