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Recently, Electro-quasistatic Human Body Communication (EQS-HBC) was demonstrated which utilizes the human body\u2019s conductive properties to communicate without radiating the signals outside the body. Previous experiments showed that an attack with an antenna was unsuccessful at a distance more than 1\u00a0cm from the body surface and 15\u00a0cm from an EQS-HBC device. However, since this is a new communication modality, it calls for\u00a0an investigation of new attack modalities\u2014that can potentially exploit the physics utilized in EQS-HBC to break the system. In this study, we present a novel attack method for EQS-HBC devices, using the body of the attacker itself as a coupling surface and capacitive inter-body coupling between the user and the attacker. We develop theoretical understanding backed by experimental results for inter-body coupling, as a function of distance between the subjects. We utilize this newly developed understanding to design EQS-HBC transmitters that minimizes the attack distance through inter-body coupling, as well as the interference among multiple EQS-HBC users due to inter-body coupling. This understanding will allow us to develop more secure and robust EQS-HBC based body area networks in the future.<\/jats:p>","DOI":"10.1038\/s41598-020-79788-9","type":"journal-article","created":{"date-parts":[[2021,2,23]],"date-time":"2021-02-23T11:05:33Z","timestamp":1614078333000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Inter-body coupling in electro-quasistatic human body communication: theory and analysis of security and interference properties"],"prefix":"10.1038","volume":"11","author":[{"given":"Mayukh","family":"Nath","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shovan","family":"Maity","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shitij","family":"Avlani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Scott","family":"Weigand","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shreyas","family":"Sen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,2,23]]},"reference":[{"key":"79788_CR1","unstructured":"Sen, S. 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