Comparison of High Capacity Improvements with Secure GEMD

• Main Authors: Sheng-Yi Chang, 張聖儀
• Other Authors: Wen-Chung Kuo
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/23407951816252892797

碩士 === 國立雲林科技大學 === 資訊工程系 === 102 === With rise of the cloud computing, lots of data, diagram, and pictures are exchanged each other via Internet and some data stores in cloud storage to increase the portability and usability. Therefore, how to ensure data security and privacy becomes a considerable issue. In information secure technique, user ensures data security using encryption and decryption which are means in Cryptography formerly. But in the development of technology, it is probability to unable to make sure data security which used encryption and decryption because increasing computing capability. Thus, another research interest is Steganography. The main of purpose in Steganography is to embed secret into cover media that achieves data security and privacy through imperceptive media. In Steganography, many proposed schemes have been employed in various techniques, such as medical data hiding, IP trace back, digital watermarking and etc. The purposes of this paper are to discuss capacity in which improvements inherited from generalized exploiting modification direction method (GEMD) and to analyze security in the mean time. GEMD is proposed in 2009, which not only has characteristics of irreversible data hiding but also improves flexible and secure. That inspired us. Consequently, we combined pixel segmentation and section-wise with GEMD. As a result, in our schemes, one achieves 4 bpp without occurring overflow; another achieves 1.5 bpp while avoiding concealing disclosure.