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Recently, a designated\u2010server PAEKS (dPAEKS) scheme was proposed to withstand KGAs. The scheme was claimed to satisfy both multi\u2010ciphertext indistinguishability (MCI) and multi\u2010trapdoor privacy (MTP). However, our cryptanalysis demonstrates that it is insecure against KGAs, where a malicious server (inside attacker) can obtain the information of the keywords embedded in the ciphertext and the trapdoor. As a result, both the MCI and MTP of the scheme are broken. In addition, the paper also shows that it is possible to break the security of MTP, even for an outside attacker. Finally, we also provide a method to fix these security flaws.<\/jats:p>","DOI":"10.1049\/ise2\/2464518","type":"journal-article","created":{"date-parts":[[2025,2,5]],"date-time":"2025-02-05T04:35:31Z","timestamp":1738730131000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Cryptanalysis of Keyword Confidentiality in a Searchable Public\u2010Key Encryption Scheme Against Malicious Server"],"prefix":"10.1049","volume":"2025","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-3989-8924","authenticated-orcid":false,"given":"Nan","family":"Zhang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7617-5462","authenticated-orcid":false,"given":"Baodong","family":"Qin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3860-2037","authenticated-orcid":false,"given":"Dong","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"265","published-online":{"date-parts":[[2025,2,5]]},"reference":[{"key":"e_1_2_10_1_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-540-24676-3_30"},{"key":"e_1_2_10_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/J.INS.2017.03.038"},{"key":"e_1_2_10_3_2","doi-asserted-by":"publisher","DOI":"10.1049\/iet-ifs.2018.5315"},{"key":"e_1_2_10_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ins.2019.12.063"},{"key":"e_1_2_10_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-030-90402-9_2"},{"key":"e_1_2_10_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.sysarc.2021.102075"},{"key":"e_1_2_10_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.sysarc.2021.102248"},{"key":"e_1_2_10_8_2","doi-asserted-by":"publisher","DOI":"10.1186\/s13677-022-00287-5"},{"key":"e_1_2_10_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.comcom.2008.11.018"},{"key":"e_1_2_10_10_2","series-title":"Lecture Notes in Computer Science","first-page":"73","volume-title":"Information Security Applications","author":"Park D. 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