A Bandwidth Efficiency of Lempel-Ziv Scheme for Data Authentication

This paper extends the bandwidth of Lempel-Ziv-Welch (LZW) and Lempel Ziv Fiala Greene (LZFG) compression schemes to hide information in the compressed codes for compressed data authentication. The proposed schemes are designed for two objectives; one is to compress a text file; the other is to hide secret information to warrant its authenticity. According to the results of experiment, the proposed scheme could easily and efficiently reach the objective of hiding secret information and only with negligible degradation in compression performance. In addition, the proposed scheme can be even used to hide secret information in medical images without distorting the image quality.