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The mechanism reveals that surface lead interstitials predominantly mediate nonradiative Auger recombination, whereas cesium vacancies act as effective Shockley-Read-Hall recombination centers, jointly governing the blinking of CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    . Alkali metal doping modulates this blinking behavior, providing precise control over the emission dynamics. Practical utility is demonstrated through a dual-mode authentication strategy that enables rapid field verification via standard smartphones while retaining high-security 4D verification via microscopy. We further establish a spatial-temporal dual-model authentication framework that integrates convolutional neural network (CNN)\u2013based spatial matching with a temporal-branch dynamic check and decision-fusion assessment. The framework resists 14 adversarial attacks spanning replay, impersonation, temporal and local manipulation, Z-stack modification, projection forgery, and synthetic forgery attack, showing robust sequence-level security beyond frame-level CNN recognition. This work transforms what was once considered a detrimental phenomenon\u2014QD blinking\u2014into a valuable asset for dynamic, high-capacity encryption, opening new avenues for ultrasecure cryptographic systems.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aed3494","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T17:59:26Z","timestamp":1787162366000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["All-inorganic perovskites for four-dimensional dynamic encryption"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-6927-433X","authenticated-orcid":true,"given":"Yongfeng","family":"Lu","sequence":"first","affiliation":[{"name":"College of Chemistry, Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, Fuzhou University, Fuzhou 350108, Fujian, China."},{"name":"School of Medicine, The Chinese University of Hong Kong, Shenzhen 518172, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-0385-1041","authenticated-orcid":true,"given":"Lianliang","family":"Li","sequence":"additional","affiliation":[{"name":"College of Chemistry, Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, Fuzhou University, Fuzhou 350108, Fujian, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-9669-5915","authenticated-orcid":true,"given":"Hongrui","family":"Cheng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemistry for NBC Hazards Protection, Beijing 102205, P.R. 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