BAT: real-time inaudible sound capture with smartphones
| Autor: | Yuliang Lu, Dingwei Tan, Longlong Li, Xuehu Yan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Sound (medical instrument)
Computer Networks and Communications Hardware and Architecture Computer science Human–computer interaction Media Technology Covert channel Covert communication Multimedia information systems Bidirectional communication Computer communication networks Software Decoding methods |
| Zdroj: | Multimedia Tools and Applications. 80:33313-33327 |
| ISSN: | 1573-7721 1380-7501 |
| Popis: | People tend to store important information on air-gapped devices and believe that the information is safe. But in recent years, more and more methods have been proposed to exfiltrate information from an air-gapped system. The methods of breaking through air-gapped can be divided into electromagnetic, thermal, acoustic and optical covert channels. Acoustic covert channels are studied by many researchers and no researchers have focused on real-time communication using inaudible sound. In this paper we propose BAT, a novel real-time bidirectional communication system. By using sounds, BAT enables unobtrusive speaker-microphone data communication without affecting the primary audio-hearing experience of users. We first design a real-time covert communication system using inaudible frequencies. It can be implemented on off-the-shelf smartphones. Compared with other methods, our method is completely using inaudible frequencies and real-time covert communication is realized. Experiments show that BAT can achieve high decoding rate and better imperceptibility in various environments. The designed program BAT is highly practical. |
| Databáze: | OpenAIRE |
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