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However, conventional optical encryption strategies predominantly rely on dual\u2010wavelength excitation, tunable light sources, or software\u2010based algorithms, leading to bulky configurations and vulnerable hardware\u2010level security. Herein, we report a dual\u2010encrypted ultraviolet optical communication system based on BA\n                    <jats:sub>2<\/jats:sub>\n                    EA\n                    <jats:sub>2<\/jats:sub>\n                    Pb\n                    <jats:sub>3<\/jats:sub>\n                    Br\n                    <jats:sub>10<\/jats:sub>\n                    (\n                    <jats:bold>1<\/jats:bold>\n                    , where BA is n\u2010butylamine and EA is ethylamine) ferroelectric single\u2010crystalline thin\u2010films (SCFs). The\n                    <jats:bold>1<\/jats:bold>\n                    ferroelectric SCFs show a photoresponsivity that reaches 230% of the original level under +1.13% tensile strain. Notably, we innovatively define the strain\u2010ratio key (\u03b5\n                    <jats:sub>1<\/jats:sub>\n                    \/\u03b5\n                    <jats:sub>2<\/jats:sub>\n                    , \u03b5\n                    <jats:sub>2<\/jats:sub>\n                    \/\u03b5\n                    <jats:sub>3<\/jats:sub>\n                    , \u03b5\n                    <jats:sub>3<\/jats:sub>\n                    \/\u03b5\n                    <jats:sub>4<\/jats:sub>\n                    ) induced by distinct bending states as the intrinsic unclonable hardware secret key, and construct a 4\u2010bit combined coding scheme based on four distinguishable photocurrent levels modulated by these strain ratios to realize secure transmission of the message \u201cFJIRSM.\u201d This strain ratio\u2010based system avoids complex optical modulation, ensuring ultrahigh security, and expands the application of two\u2010dimensional ferroelectrics in advanced encrypted optoelectronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.75320","type":"journal-article","created":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T07:40:36Z","timestamp":1791790836000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dual\u2010Encrypted Ultraviolet Optical Communication Driven by Opto\u2010Piezoelectric Coupling in Two\u2010Dimensional Flexible Ferroelectric Single\u2010Crystalline Thin\u2010Films"],"prefix":"10.1002","author":[{"given":"Hang","family":"Li","sequence":"first","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. China"},{"name":"Fujian Science &amp; Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou  Fujian P. R. China"},{"name":"University of the Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yao","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. China"},{"name":"Fujian Science &amp; Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou  Fujian P. R. China"},{"name":"University of the Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-3749-7455","authenticated-orcid":false,"given":"Qianwen","family":"Guan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. China"},{"name":"Fujian Science &amp; Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou  Fujian P. R. China"},{"name":"University of the Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji","family":"Qi","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huang","family":"Ye","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. China"},{"name":"Fujian Science &amp; Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou  Fujian P. R. China"},{"name":"University of the Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenyue","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. China"},{"name":"Fujian Science &amp; Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou  Fujian P. R. China"},{"name":"University of the Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengshu","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. China"},{"name":"Fujian Science &amp; Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou  Fujian P. R. China"},{"name":"University of the Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-5636-889X","authenticated-orcid":false,"given":"Lijun","family":"Xu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou Fujian P. R. 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