Abstract:At present, the research on secret image sharing mainly focuses on gray-scale images. However, most used in daily life are color images. Therefore, it is of great significance and application value to study the secret sharing of color images. The scheme combines the secret sharing based on the Chinese remainder theorem (CRT) with DCT information hiding technology to ensure the security of color secret image transmission. At the generation end, the color secret shadow image generated by CRT is embedded into the color carrier image of users and distributed by DCT information hiding algorithm. The shadow image is extracted at the recovery end, and the color secret image is recovered by CRT. The process satisfies the (t, n) threshold. The experimental results show that the algorithm can achieve lossless recovery, and the evaluation with relevant parameters reveals that the scheme outperforms other ones.