| Summary: | 碩士 === 國立政治大學 === 資訊科學學系 === 102 === Since visual cryptography was first proposed by Naor and Shamir[1], it has been extended to many applications, including image encryption, information hiding, visual authentication and identification, and so on. One issue in visual cryptography is cheating prevention visual secret sharing (CPVSS). Ever since Horng et al[15]. showed that some participants can deceive other participants using forged transparencies, many scholars have contributed to research in this area. In this study, we show that the scheme by Liu et al[18]. is unsafe and may cause an attack, and proposed two improvements with that address different needs are more secure.
Keywords:Visual Cryptography, Cheating Prevention.
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