Domain Adaptational Text Steganalysis Based on Transductive Learning

Traditional text steganalysis methods rely on a large amount of labeled data. At the same time, the test data should be independent and identically distributed with the training data. However, in practice, a large number of text types make it difficult to satisfy the i.i.d condition between the training set and the test set, which leads to the problem of domain mismatch and significantly reduces the detection performance. In this paper, we draw on the ideas of domain adaptation and transductive learning to design a novel text steganalysis method. In this method, we design a distributed adaptation layer and adopt three loss functions to achieve domain adaptation, so that the model can learn the domain-invariant text features. The experimental results show that the method has better steganalysis performance in the case of domain mismatch.