关键词: 混沌, 图像置乱, 信息隐藏, 盲提取

Abstract: This essay has brought forward one kind of the image compound encryption algorithm which is based on chaotic mapping and gray substitution，and have adopted one-dimension logistic chaotic sequences to confuse the image ranks respectively，and has combined with gray substitution.The algorithm possesses high security.An new DCT-based information-hiding algorithm is proposed by making use of Human Visional System’s（HVS） character，and choosing the appropriate modulus after image frequency region varies，adjusting it’s odd-even mantissa，to reach the purpose，and to expand it to multi-level information-hiding technology based on other varying region，the experiments testify it has possessed the merit of high capacity，strong robust and drawing blindly.

Key words: chaos, image encryption, information hiding, drawing blindly