Improvements on Data Insertion Technique in Encrypted Image against Lossy Compression This paper proposes two techniques in enhancing the robustness of a joint image encryption and data insertion method against lossy compression 1. Safety zone is first introduced to ensure that pixel values representing xe2x80x980xe2x80x99 are separated from those representing xe2x80x981xe2x80x99 with a gap in between. This empty gap serves as a buffer so that pixels from both groups do not cross and eventually affect the extraction process. Next, majority vote is also adopted so that error can be further suppressed, although reducing number of bits that can be inserted. Results suggest that both strategies can suppress error caused by lossy compression.

HighPayload DataHiding Method for AMBTC Decompressed Images Data hiding is the art of embedding data into a cover image without any perceptual distortion of the cover image. Moreover, data hiding is a very crucial research topic in information security because it can be used for various applications. In this study, we proposed a highcapacity datahiding scheme for absolute moment block truncation coding (AMBTC) decompressed images. We statistically analyzed the composition of the secret data string and developed a unique encoding and decoding dictionary search for adjusting pixel values. The dictionary was used in the embedding and extraction stages. The dictionary provides high datahiding capacity because the secret data was compressed using dictionarybased coding. The experimental results of this study reveal that the proposed scheme is better than the existing schemes, with respect to the datahiding capacity and visual quality.