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In an Internet of Things (IoT) environment, the communicated messages contain sensitive information that are transmitted over an open channel, where message integrity and data privacy become challenging tasks. Although several traditional cryptographic security protocols can be applied for IoT security and data privacy, such as authentication, access control, key agreement, and digital signature, but they are not resilient against quantum attacks. To overcome these issues, in this article, we first present an advanced and efficient construction of postquantum lattice\u2010based signcryption scheme, and then apply the constructed lattice\u2010based signcryption in IoT applications, where data sensed by the deployed IoT smart devices is securely stored at the cloud, via the gateway nodes (aggregators). The data stored at the cloud servers cannot be even modified by them due to the involved signatures generated by the aggregators. The formal security analysis shows the robustness of our designed lattice\u2010based signcryption scheme. Other detailed information security analysis and a performance analysis with the traditional number\u2010theoretical based public key cryptosystems show the efficacy, and significantly better security and functionality features of the proposed scheme under the lattice\u2010based postquantum context.<\/jats:p>","DOI":"10.1002\/ett.4540","type":"journal-article","created":{"date-parts":[[2022,5,28]],"date-time":"2022-05-28T06:13:16Z","timestamp":1653718396000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Secure cloud\u2010based data storage scheme using postquantum integer lattices\u2010based signcryption for IoT applications"],"prefix":"10.1002","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4478-5706","authenticated-orcid":false,"given":"Dharminder","family":"Dharminder","sequence":"first","affiliation":[{"name":"Department of Mathematics Amrita School of Engineering, Amrita Vishwa Vidyapeetham  Chennai Tamil Nadu India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Uddeshaya","family":"Kumar","sequence":"additional","affiliation":[{"name":"Department of Mathematics Amrita School of Engineering, Amrita Vishwa Vidyapeetham  Chennai Tamil Nadu India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ashok Kumar","family":"Das","sequence":"additional","affiliation":[{"name":"Center for Security Theory and Algorithmic Research, International Institute of Information Technology  Hyderabad India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Basudeb","family":"Bera","sequence":"additional","affiliation":[{"name":"Center for Security Theory and Algorithmic Research, International Institute of Information Technology  Hyderabad India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Debasis","family":"Giri","sequence":"additional","affiliation":[{"name":"Department of Information Technology Maulana Abul Kalam Azad University of Technology  Nadia West Bengal India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sajjad Shaukat","family":"Jamal","sequence":"additional","affiliation":[{"name":"Department of Mathematics College of Science, King Khalid University  Abha Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8657-3800","authenticated-orcid":false,"given":"Joel J. 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