Tsung Hung Chen

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This paper presents a visual secret sharing (VSS) scheme for general access structures by using random grids. Compared to the existing VSS schemes for general access structures, the proposed scheme generates the shares of same size as that of the original secret image and does not require any codebook prior to encryption process. With these advantages, the(More)
Recently, owing to the fast-developing of the Internet technology, the popularity of the digital devices and the enhancement of the people's computer ability, therefore the demand of ubiquitous personal knowledge services has gradually been mature. People can use these services to collect information, solve problems and proceed e-learning. Therefore, how to(More)
During the learning process, sharing and participating is the important thing. Efficiently using the learning contents has been an active research topic in developing the educational material. It probes the environment of the learning process through Sharable Content Object Reference Model (SCORM). Peer to Peer (P2P) technology seems to be the most well(More)
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