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Current sensing systems concentrate on how to enhance sensing capabilities; however, the sensors or functionalities may lead to the leakage of users\u2019 privacy. In this paper, we present WiPass, a way to leverage the wireless hotspot functionality on the smart devices to snoop the unlock passwords\/patterns without the support of additional hardware. The attacker can \u201csee\u201d your unlock passwords\/patterns even one meter away. WiPass leverages the impacts of finger motions on the wireless signals during the unlocking period to analyze the passwords\/patterns. To practically implement WiPass, we are facing the difficult feature extraction and complex unlock passwords matching, making the analysis of the finger motions challenging. To conquer the challenges, we use DCASW to extract feature and hierarchical DTW to do unlock passwords matching. Besides, the combination of amplitude and phase information is used to accurately recognize the passwords\/patterns. We implement a prototype of WiPass and evaluate its performance under various environments. The experimental results show that WiPass achieves the detection accuracy of 85.6% and 74.7% for passwords\/patterns detection in LOS and in NLOS scenarios, respectively.<\/jats:p>","DOI":"10.1155\/2016\/8793025","type":"journal-article","created":{"date-parts":[[2016,4,11]],"date-time":"2016-04-11T17:01:30Z","timestamp":1460394090000},"page":"1-14","source":"Crossref","is-referenced-by-count":29,"title":["Privacy Leakage in Mobile Sensing: Your Unlock Passwords Can Be Leaked through Wireless Hotspot Functionality"],"prefix":"10.1155","volume":"2016","author":[{"given":"Jie","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaolong","family":"Zheng","sequence":"additional","affiliation":[{"name":"School of Software and TNLIST, Tsinghua University, Beijing 100084, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhanyong","family":"Tang","sequence":"additional","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tianzhang","family":"Xing","sequence":"additional","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaojiang","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dingyi","family":"Fang","sequence":"additional","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rong","family":"Li","sequence":"additional","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoqing","family":"Gong","sequence":"additional","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Feng","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Information Science and Technology, Northwest University, Xi\u2019an 710127, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"6","doi-asserted-by":"publisher","DOI":"10.1109\/tmc.2012.106"},{"issue":"2","key":"12","first-page":"145","volume":"6","year":"2009","journal-title":"International Journal of Computer Science and Information Security"},{"issue":"4","key":"17","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1145\/2534169.2486039","volume":"43","year":"2013","journal-title":"ACM SIGCOMM Computer Communication Review"},{"key":"19","doi-asserted-by":"publisher","DOI":"10.1109\/tip.2003.814255"},{"key":"21","doi-asserted-by":"publisher","DOI":"10.1109\/78.735315"},{"key":"23","doi-asserted-by":"publisher","DOI":"10.1016\/j.jsv.2006.07.037"},{"issue":"4","key":"26","first-page":"51","volume":"43","year":"2013","journal-title":"ACM SIGCOMM Computer Communication Review"},{"key":"29","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-540-74048-3_4"},{"key":"31","doi-asserted-by":"publisher","DOI":"10.1109\/TIT.2003.817427"}],"container-title":["Mobile Information Systems"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/downloads.hindawi.com\/journals\/misy\/2016\/8793025.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/misy\/2016\/8793025.xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/misy\/2016\/8793025.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2017,6,24]],"date-time":"2017-06-24T06:42:07Z","timestamp":1498286527000},"score":1,"resource":{"primary":{"URL":"http:\/\/www.hindawi.com\/journals\/misy\/2016\/8793025\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016]]},"references-count":9,"alternative-id":["8793025","8793025"],"URL":"https:\/\/doi.org\/10.1155\/2016\/8793025","relation":{},"ISSN":["1574-017X","1875-905X"],"issn-type":[{"type":"print","value":"1574-017X"},{"type":"electronic","value":"1875-905X"}],"subject":[],"published":{"date-parts":[[2016]]}}}