| Summary: | 碩士 === 國立交通大學 === 資訊科學與工程研究所 === 94 === With the increase of population having mobile phones as well as the advance of high-speed transmission capability of the wireless network, more and more multimedia data are transmitted through and displayed on public networks for mobile devices. In this study, several methods for information hiding applications, such as copyright protection, covert communication, secret sharing, and text authentication, on mobile devices are proposed. In order to restrict a user account to a specific mobile phone for downloading videos, a copyright protection method is proposed. Because users do not want to see their video productions suffering from downloading by illegal users, a copyright protection method by a lossless visible watermarking technique for videos is proposed. In order to transmit large-volume secret messages on the Internet securely, a covert communication by videos is proposed. Because of the convenience of getting shares by mobile networks, storing shares in mobile devices, and transmitting shares by the SMS, a secret sharing technique by mobile devices is proposed. Furthermore, because of the large number of usages of short messages, an authentication method for short messages is proposed. Good experimental results show the feasibility of the proposed methods.
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