Image Steganography using RSA Algorithm for Secure Communication

Steganography is a method of transmitting a secret message from a sender to a recipient in such a way that a potential intruder is unaware of its presence. The basic goal of image steganography is to make the message invisible to the viewers' sight, removing any suspicion of a hidden message. Whereas cryptography's goal is to convert readable data into unreadable data, this is done to make decryption more difficult rather than invisible. We present information on security enhanced image steganography in this paper. To improve security, the message is encrypted into cipher text and vice versa using the cryptographic technique RSA in its asymmetric version. The sender will encrypt the message with a key, embed the cipher text in an image, and send this image object along with the key to the receiver via any transmission medium, such as the internet, so that the receiver can extract the cipher text from the image and decrypt using the key that the sender has sent. The result was satisfactory and fulfilled the purpose but was limited to grayscale images only.