Linguistic Steganography using Automatically Generated Paraphrases

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• Ching-Yun (Frannie) Chang, University of Cambridge
• Thursday 27 May 2010, 12:00-12:30
• GS15, Computer Laboratory.

If you have a question about this talk, please contact Laura Rimell.

This paper describes a method for checking the acceptability of paraphrases in context. We use the Google n-gram data and a CCG parser to certify the paraphrasing grammaticality and fluency. We collect a corpus of human judgements to evaluate our system. The ultimate goal of our work is to integrate text paraphrasing into a Linguistic Steganography system, by using paraphrases to hide information in a cover text. We propose automatically generated paraphrases as a new and useful source of transformations for Linguistic Steganography, and show that our method for checking paraphrases is effective at maintaining a high level of imperceptibility, which is crucial for effective staganography.

This talk is part of the NLIP Seminar Series series.

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