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Lighthouse: Single-Server Secure Aggregation with O(1) Server-Committee Communication at Scale
Secure aggregation is a core primitive for privacy-preserving federated learning, enabling a server to compute aggregates of client …
Sanjam Garg, Alireza Kavousi, Dimitris Kolonelos, Erkan Tairi, Zhipeng Wang
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LeOPaRd: Towards Practical Post-Quantum Oblivious PRFs via 2HashDH Paradigm
In this work, we introduce a more efficient post-quantum oblivious PRF (OPRF) design, called LeOPaRd. Our proposal is round-optimal and …
Muhammed F. Esgin, Ron Steinfeld, Erkan Tairi, Jie Xu
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Hardness of M-LWE with General Distributions and Applications to Leaky Variants
The Module Learning With Errors (M-LWE) problem has become a fundamental hardness assumption for lattice-based cryptography. It offers …
Katharina Boudgoust, Corentin Jeudy, Erkan Tairi, Weiqiang Wen
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On Verifiable Delay Functions from Time-Lock Puzzles
A verifiable delay function (VDF) [Boneh et al., CRYPTO 2018] is a function that is slow-to-compute, but is quickly verifiable given a …
Hamza Abusalah, Karen Azari, Dario Fiore, Chethan Kamath, Erkan Tairi
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Impossibility of VDFs in the ROM: The Complete Picture
This paper is concerned with the question whether Verifiable Delay Functions (VDFs), as introduced by Boneh et al. [CRYPTO 2018], can …
Hamza Abusalah, Karen Azari, Chethan Kamath, Erkan Tairi, Maximilian Von Consbruch
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(Fine-Grained) Unbounded Inner-Product Functional Encryption from LWE
Inner-product functional encryption (IPFE), introduced by Abdalla-Bourse-De Caro-Pointcheval (PKC'15), is a public-key primitive that …
Valerio Cini, Erkan Tairi
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Ciphertext-Updatable Attribute-Based and Predicate Encryption from Lattices
We present a novel variant of attribute-based encryption (ABE) and predicate encryption (PE) which supports ciphertext updates, called …
Robert Schädlich, Linda Scheu-Hachtel, Erkan Tairi, Yuejun Wang
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Lower Bounds for Lattice-based Compact Functional Encryption
Functional encryption (FE) is a primitive where the holder of a master secret key can control which functions a user can evaluate on …
Erkan Tairi, Akin Ünal
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Optimizing 0-RTT Key Exchange with Full Forward Security
Secure communication protocols such as TLS 1.3 or QUIC are doing the heavy lifting in terms of security of today’s Internet. …
Christian Göth, Sebastian Ramacher, Daniel Slamanig, Christoph Striecks, Erkan Tairi, Alexander Zikulnig
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LedgerLocks: A Security Framework for Blockchain Protocols Based on Adaptor Signatures
The scalability and interoperability challenges in current cryptocurrencies have motivated the design of cryptographic protocols that …
Erkan Tairi, Pedro Moreno-Sanchez, Clara Schneidewind
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