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  <doc>
    <id>3415</id>
    <completedYear>2025</completedYear>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>107</pageFirst>
    <pageLast>122</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1203</issue>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>Springer</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>2025-10-01</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Securing End-to-End Encrypted File Sharing Services with the Messaging Layer Security Protocol</title>
    <abstract language="eng">To protect data on the servers of cloud service providers, file-sharing services rely on End-to-End Encryption (E2EE). However, existing solutions have weaknesses that allow attackers to bypass E2EE permanently after stealing a clients keys once. In this paper, a concept for an E2EE file-sharing service is proposed which does not have this vulnerability. It is based on Messaging Layer Security (MLS) groups for key distribution, an authentication system based on asymmetric cryptography, Attribute-Based Access Control (ABAC) based access rights and a tamper-proof versioned storage system for synchronising sensitive data. The applicability of the concept is demonstrated by a prototype implementation and an evaluation based on benchmarks and a security analysis. Overall, the concept can fulfil the requirements of a basic file sharing service while providing stronger security guarantees than existing solutions.</abstract>
    <parentTitle language="eng">Intelligent Distributed Computing XVII, 2024</parentTitle>
    <identifier type="url">https://link.springer.com/chapter/10.1007/978-3-031-87639-4_7</identifier>
    <identifier type="doi">10.1007/978-3-031-87639-4_7</identifier>
    <enrichment key="PeerReviewNachweis">ja</enrichment>
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    <enrichment key="opus.doi.autoCreate">false</enrichment>
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    <licence>Keine Nutzungslizenz vergeben - es gilt das deutsche Urheberrecht</licence>
    <author>Roland Helmich</author>
    <author>Lars Braubach</author>
    <author>Theresa Schulz</author>
    <author>Kai Jander</author>
    <collection role="institutes" number="">Fachbereich Wirtschaft</collection>
    <collection role="Hochschulbibliografie" number="1">Hochschulbibliografie</collection>
  </doc>
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