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dc.contributor.authorMacPherson, Lesleyen 14:23:06 (GMT) 14:23:06 (GMT)
dc.description.abstractVisual cryptography, first introduced by Naor and Shamir, allows a secret (black and white) image to be encoded and distributed to a set of participants such that certain predefined sets of participants may reconstruct the image without any computation. In 2000, Blundo, De Santis, and Naor introduced a model for grey-level visual cryptography which is a generalization of visual cryptography for general access structures. Grey-level visual cryptography extends this model to include grey-scale images. Decoding is done by the human visual system. In this thesis we survey known results of grey-level visual cryptography and visual cryptography for general access structures. We extend several visual cryptography constructions to grey-level visual cryptography, and derive new results on the minimum possible pixel expansion for all possible access structures on at most four participants.en
dc.format.extent283228 bytes
dc.publisherUniversity of Waterlooen
dc.rightsCopyright: 2002, MacPherson, Lesley. All rights reserved.en
dc.subjectComputer Scienceen
dc.subjectvisual cryptographyen
dc.subjectsecret sharingen
dc.titleGrey Level Visual Cryptography for General Access Structuresen
dc.typeMaster Thesisen
dc.pendingfalseen of Computer Scienceen
uws-etd.degreeMaster of Mathematicsen

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