Oblivious pseudorandom function: Difference between revisions

Revision as of 09:31, 22 April 2025

Revision as of 09:41, 22 April 2025

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Recently, OPRFs have been applied to password-based key exchange to [[back up]] encrypted chat histories in [[WhatsApp]]<ref>{{cite book |last1=Davies |first1=Gareth T. |last2=Faller |first2=Sebastian |last3=Gellert |first3=Kai |last4=Handirk |first4=Tobias |last5=Hesse |first5=Julia |last6=Horváth |first6=Máté |last7=Jager |first7=Tibor |chapter=Security Analysis of the WhatsApp End-to-End Encrypted Backup Protocol |series=Lecture Notes in Computer Science |title=Advances in Cryptology |date=2023 |volume=Advances in Cryptology – CRYPTO 2023: 43rd Annual International Cryptology Conference, CRYPTO 2023 |pages=330–361 |doi=10.1007/978-3-031-38551-3_11 |isbn=978-3-031-38550-6 |chapter-url=https://dl.acm.org/doi/abs/10.1007/978-3-031-38551-3_11 |access-date=2 February 2024}}</ref> and [[Messenger (software)|Facebook Messenger]].<ref>{{cite journal |last1=Lewi |first1=Kevin |last2=Millican |first2=Jon |last3=Raghunathan |first3=Ananth |last4=Roy |first4=Arnab |title=Oblivious Revocable Functions and Encrypted Indexing |journal=Cryptology ePrint Archive |date=2022 |volume=Paper 2022/1044 |url=https://eprint.iacr.org/2022/1044}}</ref> A similar use case is planned to be added in [[Signal (messaging app)|Signal Messenger]].<ref>{{cite web |title=Technology Preview for secure value recovery |url=https://signal.org/blog/secure-value-recovery/ |website=Signal |publisher=Signal Foundation|date=19 December 2019}}</ref>

=== Untraceable CAPTCHAs ===