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Consisting of a pillar[5]arene\u2010based supramolecular network grafted with spiropyran moieties, these materials display time\u2010dependent photochromic behavior with tailorable fading rates. Ultraviolet (UV) light results in isomerization of the colorless spiropyran to the corresponding colored merocyanine, while visible light or heat causes the reverse isomerization with a rate that is dependent on the density of host\u2013guest crosslinks. The kinetics of discoloration are a function of merocyanine aggregation, which becomes more pronounced as the host\u2013guest crosslink density is increased, leading to a reduced conversion rate and slower time\u2010dependent fading. The degree of crosslinking, and hence the fading rate, may be modulated via the addition of unbound pillar[5]arene host or nitrile guest as competitors. Time\u2010dependent information encryption is enabled by combining selective placement of host and guest competitors and UV patterning. UV patterning provides an initially \u201cfalse\u201d image that does not reveal the desired information, and it is only after a given time that the encrypted data appears. This work provides a unique approach to enhance the security of information storage associated with offline portable data encryption.<\/jats:p>","DOI":"10.1002\/adma.202108163","type":"journal-article","created":{"date-parts":[[2021,11,21]],"date-time":"2021-11-21T01:50:00Z","timestamp":1637459400000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":130,"title":["Paper without a Trail: Time\u2010Dependent Encryption using Pillar[5]arene\u2010Based Host\u2013Guest Invisible Ink"],"prefix":"10.1002","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6966-6407","authenticated-orcid":false,"given":"Huaqiang","family":"Ju","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemical Engineering Key Laboratory of Excited\u2010State Materials of Zhejiang Province Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chao Nan","family":"Zhu","sequence":"additional","affiliation":[{"name":"Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hu","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Engineering Key Laboratory of Excited\u2010State Materials of Zhejiang Province Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1013-5422","authenticated-orcid":false,"given":"Zachariah A.","family":"Page","sequence":"additional","affiliation":[{"name":"Department of Chemistry 105 East 24th Street Stop A5300 The University of Texas at Austin  Austin TX 78712 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1824-9563","authenticated-orcid":false,"given":"Zi Liang","family":"Wu","sequence":"additional","affiliation":[{"name":"Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University  Hangzhou 310027 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9576-1325","authenticated-orcid":false,"given":"Jonathan L.","family":"Sessler","sequence":"additional","affiliation":[{"name":"Department of Chemistry 105 East 24th Street Stop A5300 The University of Texas at Austin  Austin TX 78712 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3177-6744","authenticated-orcid":false,"given":"Feihe","family":"Huang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Engineering Key Laboratory of Excited\u2010State Materials of Zhejiang Province Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University  Hangzhou 310027 China"},{"name":"ZJU\u2010Hangzhou Global Scientific and Technological Innovation Center  Hangzhou 311215 China"},{"name":"Green Catalysis Center and College of Chemistry Zhengzhou University  Zhengzhou 450001 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,12,26]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cose.2013.04.004"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/d41586-018-07449-z"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.comcom.2007.03.007"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1130992"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1364\/AO.58.002702"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5SC04450B"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/C9TC06297A"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0262-4079(09)61764-4"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms15895"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1039\/C7CS00246G"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201705310"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202006844"},{"key":"e_1_2_7_13_1","first-page":"5611","volume":"1","author":"Yoon B.","year":"2013","journal-title":"J. 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