In this paper, we describe a novel approach to intrinsic plagiarism detection. Each
suspicious document is divided into a series of consecutive, potentially overlapping
'windows' of equal size. These are represented by vectors containing the relative
frequencies of a predetermined set of high-frequency character trigrams. Subsequently, a
distance matrix is set up in which each of the document's windows is compared to each
other window. The distance measure used is a symmetric adaptation of the normalized …