|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Practical Linguistic Steganography using Synonym Substitution
If you have a question about this talk, please contact Wei Ming Khoo.
Linguistic Steganography is concerned with hiding information in a natural language text, for the purposes of sending secret messages. A related area is natural language watermarking, in which information is added to a text in order to identify it, for example for the purposes of copyright. Linguistic Steganography algorithms hide information by manipulating properties of the text, for example by replacing some words with their synonyms. Unlike image-based steganography, linguistic steganography is in its infancy with little existing work. In this talk we will motivate the problem, in particular as an interesting application for Natural Language Processing (NLP) and especially natural language generation. Linguistic steganography is a difficult NLP problem because any change to the cover text must retain the meaning and style of the original, in order to prevent detection by an adversary.
Our method embeds information in the cover text by replacing words in the text with appropriate substitutes. We use a large database of word sequences collected from the Web (the Google n-gram data) to determine if a substitution is acceptable, obtaining promising results from an evaluation in which human judges are asked to rate the acceptability of modified sentences.
This talk is part of the Computer Laboratory Security Seminar series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsCambridge Centre for Climate Science Genetics Postdoc Seminar Cambridge University Global Health Student Initiative
Other talksRail Exclusive - DfT TBC (SP Workshop) Cambridge in the Fifties and Sixties: an extended conversation The 2016 Obesity Summit Behavioral flexibility is not predicted by innovation or brain size in great-tailed grackles, New Caledonian crows, and Western scrub jays TBC (SP Workshop)