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Security has become the top priority in any system of computers application, online systems application etc. as millions of users are using Internet. This research paper proposes an algorithm for implementation of Information Security System using PNG (Portable Network Graphics) images. With the best of our knowledge, very few works are there in literature on PNG image steganography domain. Thus proposed algorithm has applied on PNG image with the unique concepts, like data capacity pre-estimation, generated unique key, double encryption of generated key (at hidden location), clustering of cover image and data scattering to embed secret data. The proposed algorithm transfers securely, more than 40 thousand bits on Internet using PNG image. Information can be the any type of data like picture image, video, audio or text in the form of bits. This research provides secure way of information communication and reduces the possibilities of the attack like cropping and brute force attack during transmission over internet. The proposed research will provide better capacity and security as compared to previous PNG image format works. Moreover, comparative results for the proposed algorithm is very promising for PNG cover image format. Steganalyzer tool is also used to check the performance evaluation against cropping and brute force attack.

PSNR (Peak Signal to noise Ratio): PSNR is an visual quality indicator of an image. It shows the perceptible quality for any image in unit decibels (dB). Higher PSNR indicates better quality of stego image. PSNR Value almost 30 to 35 dB or higher indicates the acceptable image quality.