| ELECTRONIC ENGINEERING |
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Detection of instant voice communication steganography using semi-supervised learning |
| TU Shanshan, TAO Huaizhou, HUANG Yongfeng |
| Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Existing instant voice communication steganalysis schemes are mainly based on supervised learning classifiers. These kinds of methods need large amounts of pre-processing and training and their accuracy can be easily destroyed by differences between the distribution of the training and testing data sets. This paper describes a semi-supervised hybrid detection model to improve detection which removes the manually annotated training data set, so this model is simpler and gives better detection scopes. This paper also describes a self-learning, multi-criteria fusion module which can automatically generate pseudo-labelled sets and combines the confidence and representative levels to judge the performance of instant voice communication steganalysis. There is no distribution mismatch between the testing data and the training data in this method. Tests with common low bit-rate speech coding carriers show that this method is more accurate than the un-supervised method and the supervised method in mismatched conditions. When the distributions of the training and testing data sets differ, this method is less affected than the supervised method. The tests also show that this method can be deployed on different kinds of speech codecs.
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| Keywords
instant voice communication
semi-supervised learning
steganalysis
confidence level
representative level
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Issue Date: 15 November 2015
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2015,
Vol. 55
