Secure Image Encryption using Playfair Cipher with Quadrant-Based Division
Manik Rakhra, Dalwinder Singh, Arun Pratap Singh, Baljinder Kaur, MD Khadimul Islam Zim, Janpreet Singh · 2023
Numerous photo encryption techniques have been presented in the previous decade, thanks to the increased focus on image encryption within data security research. Image encryption is different from textual content encryption due to the intrinsic properties of images, such as their mass records capacity and excessive records redundancy, making it far more challenging to address them utilising standard encryption processes. A new photo encryption add-on that uses Playfair cypher to better securely encode image data. The image is divided into four equal quadrants, which is the method indicated. A different image is shown in each of the four corners. The first quadrant consists of the top left corner, the second of the top right corner, the third of the bottom left corner, and the fourth of the remaining space. In the suggested approach, each quadrant picture functions as a standalone image that is encrypted using a random key. Once the images have been encrypted, they are combined into a single entity, making decryption very challenging. The fundamental goal of our research is to protect images from unauthorised duplication and distribution by encrypting data based on them using a suitable key.