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This paper proposes a novel lossless informationhiding scheme that hides information in locally adaptive compressed codes. The scheme is abbreviated as IHLAC for wider the efficiency of the compressed codes. IHLAC is designed for two objectives; one is to compress a text file; the other is to hide secret information in it. According to the experimental results, IHLAC can easily and efficiently reach the objective of hiding huge secret information. IHLAC can exactly decompress the original text file and extract the secret information. Only a small number of extra bits are needed to record the hidden information. In addition, the IHLAC can be even used to hide secret information in image files without distorting the image quality.

A Bandwidth Efficiency of the Locally Adaptive Compression Method for Hiding Secret Messages