A new multi-secret image sharing scheme based on DCT

Multi-secret image sharing scheme (MSIS) is a technique to share multiple secret images over the internet. Normally, most of the secret image sharing schemes can share only a single secret image. However, due to the rapid development of internet technology, the necessity of sharing multiple images arises. An (n, n) MSIS is employed to share n images to n authorized participants. All the n participants are required to submit their respective shares to recover the original secret images. If the number of the participants is less than n, then reconstruction of the secret images is impossible. Most of the existing schemes which are in the frequency domain do not have the capability to handle multiple secret images. In this paper, a MSIS that uses the Discrete Cosine Transform is proposed to overcome the limitation present in the existing schemes. Moreover, the proposed scheme requires less computational time than the existing schemes. Security of the proposed scheme is analyzed and shows that the proposed scheme is computationally secure. Also, the proposed scheme can recover the same original secret images.