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The use of different wavelengths allows optical information to be configured in different ways, while broadband photoresponse enables these wavelength signals to be detected within a single device. Based on this approach, this study fabricated a broadband transparent phototransistor that operates across ultraviolet to infrared wavelengths. The IGZO\/Ag2O\/IGZO stacked structure exhibited a lower oxygen-related defect component and improved device stability. The responsivity increased by a factor of 2.38 and the noise equivalent power decreased by a factor of 1.95 compared to the IGZO\/Ag2O device. The broadband photoresponse properties of the device enabled the separation of key and data channels, while a dynamic key enhanced security. This approach restricts pattern recognition compared to using fixed keys, resulting in a higher security rate. The learning-based approach was evaluated under noise and sensitivity-drift conditions, together with the effect of photoresponse stability under repetitive operation. These results contribute to the fabrication of broadband transparent phototransistors, facilitating high-performance optical encryption systems.<\/jats:p>","DOI":"10.1021\/acsami.6c13144","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T21:01:31Z","timestamp":1792098091000},"page":"57871-57882","source":"Crossref","is-referenced-by-count":0,"title":["Deep Learning-Assisted Noise-Robust Optical Encryption Enabled by Pentachromatic Phototransistors"],"prefix":"10.1021","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-6247-875X","authenticated-orcid":true,"given":"Yu bin","family":"Kim","sequence":"first","affiliation":[{"name":"Kyung Hee University , , ,","place":["Yongin, Republic of Korea, 17104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-5268-8163","authenticated-orcid":true,"given":"Kyusun","family":"Han","sequence":"additional","affiliation":[{"name":"Soongsil University , , ,","place":["Seoul, Republic of Korea, 06978"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min Jung","family":"Choi","sequence":"additional","affiliation":[{"name":"Kyung Hee University , , ,","place":["Yongin, Republic of Korea, 17104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jung Min","family":"Yun","sequence":"additional","affiliation":[{"name":"Kyung Hee University , , ,","place":["Yongin, Republic of Korea, 17104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joon Woo","family":"Park","sequence":"additional","affiliation":[{"name":"Yonsei University , , ,","place":["Seoul, Republic of Korea, 03722"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4944-8319","authenticated-orcid":true,"given":"Yeonjin","family":"Yi","sequence":"additional","affiliation":[{"name":"Yonsei University , , ,","place":["Seoul, Republic of Korea, 03722"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1212-2278","authenticated-orcid":true,"given":"Hongseok","family":"Oh","sequence":"additional","affiliation":[{"name":"Soongsil University , , ,","place":["Seoul, Republic of Korea, 06978"]},{"name":"Soongsil University , , ,","place":["Seoul, Republic of Korea, 06978"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0553-934X","authenticated-orcid":true,"given":"Seong Jun","family":"Kang","sequence":"additional","affiliation":[{"name":"Kyung Hee University , , ,","place":["Yongin, Republic of Korea, 17104"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,15]]},"reference":[{"issue":"2","key":"2026102914073413100_cit1","doi-asserted-by":"publisher","first-page":"65","DOI":"10.1016\/j.dcan.2016.03.002","article-title":"Recent progress on high-speed optical transmission","volume":"2","author":"Yu","year":"2016","journal-title":"Digit. 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