活动/讲座时间：2013-04-17 下午 15:00

活动/讲座地点：九里校区逸夫楼 4505B

活动/讲座嘉宾：张真诚教授

嘉宾介绍：

张真诚教授，新竹交通大学计算机工程专业博士，台湾清华大学硕士和学士。现任逢甲大学讲座教授、台湾清华大学和中正大学合聘教授。他曾先后担任中兴大学教授、中正大学工学院院长、教务长、代理校长等职务。张教授在数据库设计、多媒体影像技术、密码学、电子商务安全等领域有卓越研究贡献，为 IEEE 会士与英国 IEE 会士。曾获台湾第一届十大杰出资讯人才奖、杰出电机工程教授、杰出工程教授、中山学术著作奖等

主要内容：

Information Steganography Using Magic Matrix Steganography (隐藏技术）is the science of secret message delivery using cover media. A digital image is a flexible medium used to carry a secret message because the slight modification of a cover image is hard to distinguish by human eyes. In this talk, I will introduce three methods: Kim et al.s method, Zhang and Wang’s method and Sudoku solutions. A selected Sudoku solution is used to guide cover pixels’ modification in order to imply secret data. Because the number of possible Sudoku solutions is very large, the proposed method is more secure than Kim et al.s method and Zhang and Wang’s method. From the experimental results, the visual quality of stego images produced by the Sudoku method is higher than 44 dB in average, which is slightly less than that of related works; however, the embedding capacity of the proposed method is 1.5 bit per pixel, which is greater than that of the related works.