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Efficient Laconic Cryptography from Learning with Errors

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conference contribution
posted on 2024-03-20, 10:43 authored by Nico Döttling, Dimitris Kolonelos, Russell WF Lai, Chuanwei Lin, Giulio Malavolta, Ahmadreza Rahimi

 

Laconic cryptography is an emerging paradigm that enables cryptographic primitives with sublinear communication complexity in just two messages. In particular, a two-message protocol between Alice and Bob is called laconic if its communication and computation complexity are essentially independent of the size of Alice's input. This can be thought of as a dual notion of fully-homomorphic encryption, as it enables "Bob-optimized" protocols. This paradigm has led to tremendous progress in recent years. However, all existing constructions of laconic primitives are considered only of theoretical interest: They all rely on non-black-box cryptographic techniques, which are highly impractical.  This work shows that non-black-box techniques are not necessary for basic laconic cryptography primitives. We propose a completely algebraic construction of laconic encryption, a notion that we introduce in this work, which serves as the cornerstone of our framework. We prove that the scheme is secure under the standard Learning With Errors assumption (with polynomial modulus-to-noise ratio). We provide proof-of-concept implementations for the first time for laconic primitives, demonstrating the construction is indeed practical: For a database size of 2 50, encryption and decryption are in the order of single digit milliseconds.  Laconic encryption can be used as a black box to construct other laconic primitives. Specifically, we show how to construct:  

- Laconic oblivious transfer 

- Registration-based encryption scheme  

- Laconic private-set intersection protocol

All of the above have essentially optimal parameters and similar practical efficiency. Furthermore, our laconic encryption can be preprocessed such that the online encryption step is entirely combinatorial and therefore much more efficient. Using similar techniques, we also obtain identity-based encryption with an unbounded identity space and tight security proof (in the standard model).


History

Primary Research Area

  • Algorithmic Foundations and Cryptography

Name of Conference

International Conference on the Theory and Application of Cryptographic Techniques (EuroCrypt)

Journal

EUROCRYPT (3)

Volume

14006

Page Range

417-446

Publisher

Springer Nature

Open Access Type

  • Not Open Access

BibTeX

@inproceedings{Döttling:Kolonelos:Lai:Lin:Malavolta:Rahimi:2023, title = "Efficient Laconic Cryptography from Learning with Errors", author = "Döttling, Nico" AND "Kolonelos, Dimitris" AND "Lai, Russell WF" AND "Lin, Chuanwei" AND "Malavolta, Giulio" AND "Rahimi, Ahmadreza", year = 2023, month = 4, journal = "EUROCRYPT (3)", pages = "417--446", publisher = "Springer Nature", issn = "1611-3349", doi = "10.1007/978-3-031-30620-4_14" }