Improved Vigenere Cipher-RSA-Based Medical Image Security Through Multiple Encryption Keys

With the rapid evolution of telecommunication technologies, new means to share patients' medical images have consistently developed, leading to changes in their protection strategies. Consequently, researchers are paying attention to increasing security and privacy of sensitive medical images. However, brute-force, geometric and non-geometric attacks and unlawful manipulation have occurred in recent years. This paper attempts to propose a robust and hybrid encryption approach using improved Vigenere cipher and RSA that helps enhance security and integrity in medical images and protect sensitive data. The medical images come from different modalities such as X-ray, CT and MRI. The traditional public and private keys for the RSA algorithm is enhanced by adding a second key to the medical image. The second key and RSA keys are used to encode and decode the image which makes the decryption process considerably more difficult with correct key combinations. By incorporating the second key, the proposed approach addresses the challenges related to confidentiality and security in medical image transmission. Therefore, the proposed approach shows promising results in enhancing security and providing good performance of image encryption/decryption processes.