{"department":[{"_id":"ElKo"}],"type":"conference","publication_status":"published","quality_controlled":"1","day":"01","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_created":"2024-02-14T14:20:40Z","article_processing_charge":"No","date_updated":"2024-02-19T12:11:15Z","year":"2023","title":"Parakeet: Practical key transparency for end-to-end eEncrypted messaging","citation":{"chicago":"Malvai, Harjasleen, Eleftherios Kokoris Kogias, Alberto Sonnino, Esha Ghosh, Ercan Oztürk, Kevin Lewi, and Sean Lawlor. “Parakeet: Practical Key Transparency for End-to-End EEncrypted Messaging.” In <i>Proceedings of the 2023 Network and Distributed System Security Symposium</i>. Internet Society, 2023. <a href=\"https://doi.org/10.14722/ndss.2023.24545\">https://doi.org/10.14722/ndss.2023.24545</a>.","ieee":"H. Malvai <i>et al.</i>, “Parakeet: Practical key transparency for end-to-end eEncrypted messaging,” in <i>Proceedings of the 2023 Network and Distributed System Security Symposium</i>, San Diego, CA, United States, 2023.","ista":"Malvai H, Kokoris Kogias E, Sonnino A, Ghosh E, Oztürk E, Lewi K, Lawlor S. 2023. Parakeet: Practical key transparency for end-to-end eEncrypted messaging. Proceedings of the 2023 Network and Distributed System Security Symposium. NDSS: Network and Distributed Systems Security.","ama":"Malvai H, Kokoris Kogias E, Sonnino A, et al. Parakeet: Practical key transparency for end-to-end eEncrypted messaging. In: <i>Proceedings of the 2023 Network and Distributed System Security Symposium</i>. Internet Society; 2023. doi:<a href=\"https://doi.org/10.14722/ndss.2023.24545\">10.14722/ndss.2023.24545</a>","apa":"Malvai, H., Kokoris Kogias, E., Sonnino, A., Ghosh, E., Oztürk, E., Lewi, K., &#38; Lawlor, S. (2023). Parakeet: Practical key transparency for end-to-end eEncrypted messaging. In <i>Proceedings of the 2023 Network and Distributed System Security Symposium</i>. San Diego, CA, United States: Internet Society. <a href=\"https://doi.org/10.14722/ndss.2023.24545\">https://doi.org/10.14722/ndss.2023.24545</a>","short":"H. Malvai, E. Kokoris Kogias, A. Sonnino, E. Ghosh, E. Oztürk, K. Lewi, S. Lawlor, in:, Proceedings of the 2023 Network and Distributed System Security Symposium, Internet Society, 2023.","mla":"Malvai, Harjasleen, et al. “Parakeet: Practical Key Transparency for End-to-End EEncrypted Messaging.” <i>Proceedings of the 2023 Network and Distributed System Security Symposium</i>, Internet Society, 2023, doi:<a href=\"https://doi.org/10.14722/ndss.2023.24545\">10.14722/ndss.2023.24545</a>."},"publication":"Proceedings of the 2023 Network and Distributed System Security Symposium","date_published":"2023-03-01T00:00:00Z","oa_version":"Published Version","abstract":[{"text":"Encryption alone is not enough for secure end-to end encrypted messaging: a server must also honestly serve public keys to users. Key transparency has been presented as an efficient\r\nsolution for detecting (and hence deterring) a server that attempts to dishonestly serve keys. Key transparency involves two major components: (1) a username to public key mapping, stored and cryptographically committed to by the server, and, (2) an outof-band consistency protocol for serving short commitments to users. In the setting of real-world deployments and supporting production scale, new challenges must be considered for both of these components. We enumerate these challenges and provide solutions to address them. In particular, we design and implement a memory-optimized and privacy-preserving verifiable data structure for committing to the username to public key store.\r\nTo make this implementation viable for production, we also integrate support for persistent and distributed storage. We also propose a future-facing solution, termed “compaction”, as\r\na mechanism for mitigating practical issues that arise from dealing with infinitely growing server data structures. Finally, we implement a consensusless solution that achieves the minimum requirements for a service that consistently distributes commitments for a transparency application, providing a much more efficient protocol for distributing small and consistent\r\ncommitments to users. This culminates in our production-grade implementation of a key transparency system (Parakeet) which we have open-sourced, along with a demonstration of feasibility through our benchmarks.","lang":"eng"}],"conference":{"start_date":"2023-02-27","end_date":"2023-03-03","name":"NDSS: Network and Distributed Systems Security","location":"San Diego, CA, United States"},"status":"public","month":"03","author":[{"last_name":"Malvai","full_name":"Malvai, Harjasleen","first_name":"Harjasleen"},{"full_name":"Kokoris Kogias, Eleftherios","last_name":"Kokoris Kogias","first_name":"Eleftherios","id":"f5983044-d7ef-11ea-ac6d-fd1430a26d30"},{"first_name":"Alberto","full_name":"Sonnino, Alberto","last_name":"Sonnino"},{"last_name":"Ghosh","full_name":"Ghosh, Esha","first_name":"Esha"},{"last_name":"Oztürk","full_name":"Oztürk, Ercan","first_name":"Ercan"},{"first_name":"Kevin","last_name":"Lewi","full_name":"Lewi, Kevin"},{"first_name":"Sean","last_name":"Lawlor","full_name":"Lawlor, Sean"}],"publication_identifier":{"isbn":["1891562835"]},"oa":1,"language":[{"iso":"eng"}],"publisher":"Internet Society","_id":"14989","main_file_link":[{"url":"https://eprint.iacr.org/2023/081","open_access":"1"}],"doi":"10.14722/ndss.2023.24545","acknowledgement":"This work is supported by the Novi team at Meta and funded in part by IC3 industry partners and NSF grant 1943499."}