| Summary: | 碩士 === 國立暨南國際大學 === 電機工程學系 === 103 === Abstract
Communication is easy to be eavesdropped as it travels on the Internet. Therefore, steganography is a good solution to protect important Voice over Internet Protocol (VoIP ) conversations. By this mechanism, eavesdroppers may only feel there are some noises in a VoIP call, but will not notice an important secret conversation is hidden in that call.
In this thesis, we propose a method for voice hiding in a real-time communication system using the G.711 codec. The proposed method applies Discrete Cosine Transform (DCT) to hide a secret conversation into frequency coefficients which could prevent eavesdropping and resist Regular and Singular (RS) steganalysis.
Key words: DCT, G.711, RS steganalysis, Steganography, VoIP
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