Detecting Word Substitution in Adversarial Communication
نویسندگان
چکیده
When messages may be intercepted because they contain certain words, terrorists and criminals may replace such words by other words or locutions. If the replacement words have different frequencies from the original words, techniques to detect the substitution are known. In this paper, we consider ways to detect replacements that have similar frequencies to the original words. We consider the frequencies of generalized n-grams that we call kgrams, the change in frequency that results from removing the word under consideration from its context, and the change in frequency that results from replacing a word by its hypernym. In our preliminary results, none of these measures are strong individually, but together they become effective.
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