Abstract: Images are one of the important type of multimedia which are largely used in the area of computer vision, graphics, medical systems, databases etc. Image transmission is required when the source and destination are situated at a distance. The transmission of image through the network faces a lot of attacks and security problems. Hence a secure image transmission technique is necessary today. Mosaic image is a steganography technique for secure image transmission. But encryption and audio conversion can add the security aspect of the image to be sent. Hence the encrypted mosaic image as an audio will be sent through the network for the secure image transmission. The combined use of cryptography and sound steganography provides an enhancement for image security.

Keywords: Encryption, Mosaic Image, Advanced Encryption Standard.