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Secure Progressive Visual Secret Sharing

安全漸進視覺秘密分享

摘要


With visual secret sharing (VSS) in mind, to claim security guarantee of VSS is meaningful only when each single share image reveals no information about the secret image. Fang and Lin proposed a progressive visual secret sharing scheme, which claimed the secret image emerges gradually with the increasing number of stacking shares. However, their scheme fails to conceal secret information on any single share. As a result, a secret image is visually recognizable on each single share such that it is not a secure progressive visual secret sharing scheme. In order to overcome the above-mentioned problem and, simultaneously, achieve securely progressive property, a new progressive visual secret sharing method is proposed in this paper by redesigning basis matrices satisfying the security requirement for encoding the secret image. The experimental results illustrate that any single share looks noisy such that proposed visual secret sharing scheme is secure and progressive.

並列摘要


視覺密碼分享技術(VSS)惟有在任一單張分想影像(share)不顯露原始祕密影像訊息的情況下才有其意義與價值,Fang and Lin所提出的漸進式視覺秘密分享技術中聲稱隨著堆疊的share數量增加,秘密影像將愈清楚明顯地逐漸浮現,然而,在他們的方法中,在任一單張分享影像並無法隱藏秘密資訊,以至於任一單張分享影像會顯露出原始秘密影項的訊息。因此,其所提的方法並不是一個安全的漸進式視覺秘密分享技術,為了解決前述的缺點同時達成安全漸進特性,本論文重新設計符合安全條件需求的basis matrix來編碼秘密影像,實驗結果也證明任一單張share是非常noisy沒有祕密影像顯示出來的現象,且當堆疊的share數量增加時影像也逐漸清晰浮現。

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