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Grey Level Visual Cryptography for General Access Structures

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dc.contributor.authorMacPherson, Lesleyen
dc.date.accessioned2006-08-22T14:23:06Z
dc.date.available2006-08-22T14:23:06Z
dc.date.issued2002en
dc.date.submitted2002en
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.formatapplication/pdfen
dc.format.extent283228 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/10012/1126
dc.language.isoenen
dc.pendingfalseen
dc.publisherUniversity of Waterlooen
dc.rightsCopyright: 2002, MacPherson, Lesley. All rights reserved.en
dc.subjectComputer Scienceen
dc.subjectvisual cryptographyen
dc.subjectsecret sharingen
dc.subjectcryptographyen
dc.titleGrey Level Visual Cryptography for General Access Structuresen
dc.typeMaster Thesisen
uws-etd.degreeMaster of Mathematicsen
uws-etd.degree.departmentSchool of Computer Scienceen
uws.peerReviewStatusUnrevieweden
uws.scholarLevelGraduateen
uws.typeOfResourceTexten

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