writeprint
n. The set of writing style characteristics that uniquely identify the author of a text. Also: write-print.
writeprinting pp.

Example Citations:
However, there may exist an alternative method for "unmasking" anonymous bloggers, cyber-stalkers, etc. using public information. Everyone has a unique writeprint (basically a written fingerprint that can be used to identify him or her). This technique s has traditionally been used to identify the true author of a text (e.g. a book) where authorship is disputed or unknown. Forensics linguistics has been used to provide evidence in trademark disputes cases, identifying the author of anonymous texts (such as threat or harassment letters), and identifying cases of plagiarism.
—Robert Hudock, "Fingerprinting (Writeprinting) Text Using Stylistic Features Can Be Used To Accurately Identify the Authorship of Anonymous Emails, Blog Entries and IRC Chat Sessions," Law Blog 2.0, June 20th, 2009

For the first time, said data-mining expert Benjamin Fung, analysts have used the complex algorithms and almost imperceptible human quirks that make up the concept of "frequent pattern" to work out each person's unique email fingerprint or "write-print."
—Lesley Ciarula Taylor, "Canadian scientists crack code for tracing anonymous emails," The Toronto Star, March 9, 2011

Earliest Citation:
Unlike conventional crimes, there are no fingerprints to be found in cybercrime. Fortunately, there is another type of print, which we call "writeprint," hidden in people's writings. Similar to fingerprints, writeprint is composed of multiple features, such as vocabulary richness, length of sentence, use of function words, layout of paragraphs, and key words.
—Jiexun Li, Rong Zheng, Hsinchun Chen, "From fingerprint to writeprint" (PDF), Communications of the ACM, April 1, 2006

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