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Contact-based online electronic signatures are limited by indirect contact such as handwriting pads and may threaten the health of users. Consider combining hand shape features and writing process features to form electronic signatures, the article proposes an in-air handwritten signature verification system with millimeter-wave(mmWave) radar, namely mmHSV. First, the biometrics of the handwritten signature process are modeled, and phase-dependent biometrics and behavioral features are extracted from the mmWave radar mixture signal. Secondly, a handwritten feature recognition network based on few-sample learning is presented to fuse multi-dimensional features and determine user legitimacy. Finally, mmHSV is implemented and evaluated with commercial mmWave devices in different scenarios and attack mode conditions. Experimental results show that the mmHSV can achieve accurate, efficient, robust and scalable handwritten signature verification. Area Under Curve (AUC) is 98.96%, False Acceptance Rate (FAR) is 5.1% at the fixed threshold, AUC is 97.79% for untrained users.<\/jats:p>","DOI":"10.1145\/3614443","type":"journal-article","created":{"date-parts":[[2023,8,12]],"date-time":"2023-08-12T11:15:42Z","timestamp":1691838942000},"page":"1-22","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":13,"title":["mmHSV: In-Air Handwritten Signature Verification via Millimeter-Wave Radar"],"prefix":"10.1145","volume":"4","author":[{"given":"Wanqing","family":"Li","sequence":"first","affiliation":[{"name":"School of Information Science and Engineering, Yanshan University, China P.R."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tongtong","family":"He","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, Yanshan University, China P.R."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5495-7794","authenticated-orcid":false,"given":"Nan","family":"Jing","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, Yanshan University, China P.R."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7691-4672","authenticated-orcid":false,"given":"Lin","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, Yanshan University, China P.R."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2023,11,22]]},"reference":[{"issue":"3","key":"e_1_3_1_2_2","first-page":"13","article-title":"Biometric authentication: A review","volume":"2","author":"Bhattacharyya Debnath","year":"2009","unstructured":"Debnath Bhattacharyya, Rahul Ranjan, Farkhod Alisherov, Minkyu Choi, et\u00a0al. 2009. 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