A High Capacity Information Hiding Algorithm Based on Invariance Properties of JPEG Compression

Abstract

Imperceptibility, robustness and hiding capacity are main indexes to measure information hiding algorithm. However, they always restrict each other.  Invariance of JPEG compression has been analyzed at first. Then, according to invariance of JPEG compression, information hiding algorithm which can embed information in DCT median and high frequency coefficients has been proposed. Information embedding capacity adaptively determined by smooth state of subblocks, hence hiding capacity can be increased under the condition of satisfy imperceptibility. The algorithm has strong robustness against lossy compression with quality factor not exceed default, besides, experiences show that it has a certain degree of antinoise ability.