Collusive Attacks to Partition Authentication Visual Cryptography Scheme
In order to preventing cheating attack, partition authentication visual cryptography scheme (PAVCS) was proposed, in which each authentication pattern can be revealed on the stacked result of the corresponding partitions of any two shares. Without needing extra share, a PAVCS not only accomplishes sharing a secret image, but also provides mutual authentication of every two shares. In this paper, we propose two types of collusive attacks to (k, n)-PAVCS. The aim of the first type of attack is to destroy the integrity of the secret image revealed by victims, while the second type of attack belongs to cheating attack. Experimental results and theoretical analysis show that the two types of collusive attacks are successful attacks. Furthermore, we put forward the suggestion to devise partition authentication visual cryptography scheme for resisting the proposed two types of collusive attacks.
KeywordsVisual cryptography scheme Visual secret sharing Cheating prevention visual cryptography scheme (CPVCS) Partition authentication visual cryptography scheme (PAVCS) Collusive attack
Many thanks to the anonymous reviewers for their valuable comments. This work was supported by NSFC No. 61671448, the “Strategic Priority Research Program” of the Chinese Academy of Sciences grant No. XDA06010701, the National Key R&D Program of China with No. 2016YFB0800100 and the Scientific Research Project of Beijing Municipal Educational Committee grant No. 71E1610972.
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