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ESSVCS: an enriched secret sharing visual cryptography. (English) Zbl 1407.68146

Shi, Yun Q. (ed.) et al., Transactions on Data Hiding and Multimedia Security IX. Special issue on visual cryptography. Berlin: Springer. Lect. Notes Comput. Sci. 8363, 1-24 (2014).
Summary: Visual cryptography (VC) is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography with that of raster graphics. A binary image can be divided into shares that are able to be stacked together so as to approximately recover the original image. VC is a unique technique in the sense that the encrypted message can be decrypted directly by the human visual system (HVS). The distinguishing characteristic of VC is the ability of secret restoration without the use of computation. However because of restrictions of the HVS, pixel expansion and alignment problems, a VC scheme perhaps can only be applied to share a small size of secret image. In this paper, we propose a general method to let the VC shares carry more secrets, the technique is to use cypher output of private-key systems as the input random numbers of VC scheme, meanwhile the encryption key could be shared, the shared keys could be associated with the VC shares. After this operation, VC scheme and secret sharing scheme are merged with the private-key system. Under this design, we implement a \((k,t,n)\)-VC scheme. Compared to those existing schemes, our approach could greatly enhance the ability of current VC schemes and could cope with pretty rich secrets.
For the entire collection see [Zbl 1284.68033].

MSC:

68P25 Data encryption (aspects in computer science)
68U10 Computing methodologies for image processing
94A60 Cryptography
94A62 Authentication, digital signatures and secret sharing
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