Graduate writing is receiving increasing attention, particularly in contexts of diverse student bodies and widening access to universities. In many of these contexts, writing is seen as 'a problem' in need of fixing. Often, the problem and the solution are perceived as being solely located in notions of deficit in individuals and not in the broader embedded and sometimes invisible discourse practices. An academic literacies approach shifts the focus from the individual to broader social practices. This research project emerged out of an attempt to develop a graduate research-writing pedagogy from an academic literacies perspective. We present a detailed case study of one Masters' student to illustrate the results of a pedagogy that moved beyond notions of deficit and support. We argue that to be successful research writers, students need to (1) become discourse analysts; (2) develop authorial voice and identity; and (3) acquire critical competence.
Visual cryptography is a secret sharing scheme which uses images distributed as shares such that, when the shares are superimposed, a hidden secret image is revealed. In extended visual cryptography, the share images are constructed to contain meaningful cover images, thereby providing opportunities for integrating visual cryptography and biometric security techniques. In this paper, we propose a method for processing halftone images that improves the quality of the share images and the recovered secret image in an extended visual cryptography scheme for which the size of the share images and the recovered image is the same as for the original halftone secret image. The resulting scheme maintains the perfect security of the original extended visual cryptography approach.
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