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The secure ISAC channel is modeled as two state-dependent fast-fading channels with correlated Rayleigh fading coefficients and independent additive Gaussian noise components. Delayed channel outputs are fed back to the transmitter to improve the communication performance and to estimate the channel state sequence. We establish and illustrate an achievable secrecy-distortion region for degraded secure ISAC channels under correlated Rayleigh fading, for which we show that the signal-to-interference-plus-noise is not a sufficient statistic. We also evaluate the inner bound for a large set of parameters to derive practical design insights. The presented results include parameter ranges for which the secrecy capacity of a classical wiretap channel setup is surpassed and for which the channel capacity is approached. Thus, we illustrate for correlated Rayleigh fading cases that our secure ISAC methods can (i) eliminate the need for the legitimate receiver to have a statistical advantage over the eavesdropper and (ii) provide communication security with minimal rate penalty.<\/jats:p>","DOI":"10.3390\/e27030225","type":"journal-article","created":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T11:08:50Z","timestamp":1740136130000},"page":"225","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Sensing-Assisted Secure Communications over Correlated Rayleigh Fading Channels"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6219-6967","authenticated-orcid":false,"given":"Martin","family":"Mittelbach","sequence":"first","affiliation":[{"name":"Chair of Information Theory and Machine Learning, Technische Universit\u00e4t Dresden, 01062 Dresden, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1702-9075","authenticated-orcid":false,"given":"Rafael F.","family":"Schaefer","sequence":"additional","affiliation":[{"name":"Chair of Information Theory and Machine Learning, Technische Universit\u00e4t Dresden, 01062 Dresden, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9315-9050","authenticated-orcid":false,"given":"Matthieu","family":"Bloch","sequence":"additional","affiliation":[{"name":"School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0820-3390","authenticated-orcid":false,"given":"Aylin","family":"Yener","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH 43210, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0313-7788","authenticated-orcid":false,"given":"Onur","family":"G\u00fcnl\u00fc","sequence":"additional","affiliation":[{"name":"Information Theory and Security Laboratory (ITSL), Link\u00f6ping University, 58183 Link\u00f6ping, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"30845","DOI":"10.1109\/ACCESS.2021.3059488","article-title":"Joint Design of Communication and Sensing for Beyond 5G and 6G Systems","volume":"9","author":"Wild","year":"2021","journal-title":"IEEE Access"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1109\/MCOM.002.2100972","article-title":"Towards Multi-Functional 6G Wireless Networks: Integrating Sensing, Communication and Security","volume":"60","author":"Wei","year":"2022","journal-title":"IEEE Commun. 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