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However, due to the separation of data ownership and management, it is difficult for users to check the integrity of data in a traditional way, which leads to the introduction of the auditing techniques. This paper proposes a public auditing protocol with a self-certified public key system using blockchain technology. The user's operational information and metadata information of the file are formed to a block after verified by the checked nodes and then to be put into the blockchain. The chain structure of the block ensures the security of auditing data source. The security analysis shows that attackers can neither derive user\u2019s secret key nor derive users\u2019 data from the collected auditing information in the presented scheme. Furthermore, it can effectively resist against not only the signature forging attacks but also the proof forging attacks. Compared with other public auditing schemes, our scheme based on the self-certified public key system has been improved in storage overhead, communication bandwidth, and verification efficiency.<\/jats:p>","DOI":"10.1155\/2021\/6623639","type":"journal-article","created":{"date-parts":[[2021,2,23]],"date-time":"2021-02-23T20:03:01Z","timestamp":1614110581000},"page":"1-10","source":"Crossref","is-referenced-by-count":8,"title":["A Blockchain-Based Public Auditing Protocol with Self-Certified Public Keys for Cloud Data"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2944-8613","authenticated-orcid":true,"given":"Hongtao","family":"Li","sequence":"first","affiliation":[{"name":"College of Mathematics & Computer Science, Shanxi Normal University, Linfen 041000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9521-660X","authenticated-orcid":true,"given":"Feng","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, Linyi University, Linyi 276002, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lili","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Mathematics and Informatics, Fujian Normal University, Fuzhou 350117, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Mathematics & Computer Science, Shanxi Normal University, Linfen 041000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Mathematics & Computer Science, Shanxi Normal University, Linfen 041000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuankun","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, Linyi University, Linyi 276002, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","reference":[{"issue":"3","key":"1","doi-asserted-by":"crossref","first-page":"2385","DOI":"10.1007\/s10586-016-0701-7","article-title":"New directly revocable attribute-based encryption scheme and its application in cloud storage environment","volume":"20","author":"H. 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