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<p>Session 10C: Privacy Preservation </p><p></p><center data-preserve-html-node="true"><iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen="" src="https://www.youtube-nocookie.com/embed/W6eE7rouoWQ?si=8WNlE371IOtH0_4S" width="560" frameborder="0" data-preserve-html-node="true" title="YouTube video player" height="315"></iframe>
<p></p><center data-preserve-html-node="true">Authors, Creators & Presenters: Angeliki Aktypi (University of Oxford), Kasper Rasmussen (University of Oxford)
<p></p><center data-preserve-html-node="true">PAPER<br>
<center data-preserve-html-node="true">Iris: Dynamic Privacy Preserving Search in Authenticated Chord Peer-to-Peer Networks
<p></p><center data-preserve-html-node="true">In structured peer-to-peer networks, like Chord, users find data by asking a number of intermediate nodes in the network. Each node provides the identity of the closet known node to the address of the data, until eventually the node responsible for the data is reached. This structure means that the intermediate nodes learn the address of the sought after data. Revealing this information to other nodes makes Chord unsuitable for applications that require query privacy so in this paper we present a scheme Iris to provide query privacy while maintaining compatibility with the existing Chord protocol. This means that anyone using it will be able to execute a privacy preserving query but it does not require other nodes in the network to use it (or even know about it). In order to better capture the privacy achieved by the iterative nature of the search we propose a new privacy notion, inspired by $k$-anonymity. This new notion called alpha, delta-privacy, allows us to formulate privacy guarantees against adversaries that collude and take advantage of the total amount of information leaked in all iterations of the search. We present a security analysis of the proposed algorithm based on the privacy notion we introduce. We also develop a prototype of the algorithm in Matlab and evaluate its performance. Our analysis proves Iris to be alpha, delta-private while introducing a modest performance overhead. Importantly the overhead is tunable and proportional to the required level of privacy, so no privacy means no overhead.
<p></p><center data-preserve-html-node="true">ABOUT NDSS<br>
<center data-preserve-html-node="true">The Network and Distributed System Security Symposium (NDSS) fosters information exchange among researchers and practitioners of network and distributed system security. The target audience includes those interested in practical aspects of network and distributed system security, with a focus on actual system design and implementation. A major goal is to encourage and enable the Internet community to apply, deploy, and advance the state of available security technologies.
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<p>Our thanks to the <a href="https://www.ndss-symposium.org/">Network and Distributed System Security (NDSS) Symposium</a> for publishing their Creators, Authors and Presenter’s superb <a href="https://www.youtube.com/@NDSSSymposium">NDSS Symposium 2025 Conference</a> content on the <a href="https://www.ndss-symposium.org/">Organizations’</a> <a href="https://youtube.com/@ndsssymposium?si=lLtn9sVVEwmZ8J9h3">YouTube Channel</a>. </p>
<p></p></center></center></center></center></center></center></center><p><a href="https://www.infosecurity.us/blog/2026/1/28/ndss-2025-iris-dynamic-privacy-preserving-search-in-authenticated-chord-peer-to-peer-networks">Permalink</a></p><p>
</p><div class="spu-placeholder" style="display:none"></div><div class="addtoany_share_save_container addtoany_content addtoany_content_bottom"><div class="a2a_kit a2a_kit_size_20 addtoany_list" data-a2a-url="https://securityboulevard.com/2026/01/ndss-2025-iris-dynamic-privacy-preserving-search-in-authenticated-chord-peer-to-peer-networks/" data-a2a-title="NDSS 2025 – Iris: Dynamic Privacy Preserving Search In Authenticated Chord Peer-To-Peer Networks"><a class="a2a_button_twitter" href="https://www.addtoany.com/add_to/twitter?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Fndss-2025-iris-dynamic-privacy-preserving-search-in-authenticated-chord-peer-to-peer-networks%2F&linkname=NDSS%202025%20%E2%80%93%20%20Iris%3A%20Dynamic%20Privacy%20Preserving%20Search%20In%20Authenticated%20Chord%20Peer-To-Peer%20Networks" title="Twitter" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_linkedin" href="https://www.addtoany.com/add_to/linkedin?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Fndss-2025-iris-dynamic-privacy-preserving-search-in-authenticated-chord-peer-to-peer-networks%2F&linkname=NDSS%202025%20%E2%80%93%20%20Iris%3A%20Dynamic%20Privacy%20Preserving%20Search%20In%20Authenticated%20Chord%20Peer-To-Peer%20Networks" title="LinkedIn" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_facebook" href="https://www.addtoany.com/add_to/facebook?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Fndss-2025-iris-dynamic-privacy-preserving-search-in-authenticated-chord-peer-to-peer-networks%2F&linkname=NDSS%202025%20%E2%80%93%20%20Iris%3A%20Dynamic%20Privacy%20Preserving%20Search%20In%20Authenticated%20Chord%20Peer-To-Peer%20Networks" title="Facebook" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_reddit" href="https://www.addtoany.com/add_to/reddit?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Fndss-2025-iris-dynamic-privacy-preserving-search-in-authenticated-chord-peer-to-peer-networks%2F&linkname=NDSS%202025%20%E2%80%93%20%20Iris%3A%20Dynamic%20Privacy%20Preserving%20Search%20In%20Authenticated%20Chord%20Peer-To-Peer%20Networks" title="Reddit" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_email" href="https://www.addtoany.com/add_to/email?linkurl=https%3A%2F%2Fsecurityboulevard.com%2F2026%2F01%2Fndss-2025-iris-dynamic-privacy-preserving-search-in-authenticated-chord-peer-to-peer-networks%2F&linkname=NDSS%202025%20%E2%80%93%20%20Iris%3A%20Dynamic%20Privacy%20Preserving%20Search%20In%20Authenticated%20Chord%20Peer-To-Peer%20Networks" title="Email" rel="nofollow noopener" target="_blank"></a><a class="a2a_dd addtoany_share_save addtoany_share" href="https://www.addtoany.com/share"></a></div></div><p class="syndicated-attribution">*** This is a Security Bloggers Network syndicated blog from <a href="https://www.infosecurity.us/">Infosecurity.US</a> authored by <a href="https://securityboulevard.com/author/0/" title="Read other posts by Marc Handelman">Marc Handelman</a>. Read the original post at: <a href="https://www.youtube-nocookie.com/embed/W6eE7rouoWQ?si=8WNlE371IOtH0_4S">https://www.youtube-nocookie.com/embed/W6eE7rouoWQ?si=8WNlE371IOtH0_4S</a> </p>
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