International Association for Cryptologic Research

International Association
for Cryptologic Research


Rate-1 Incompressible Encryption from Standard Assumptions

Pedro Branco , Johns Hopkins University
Nico Döttling , Helmholtz Center for Information Security (CISPA)
Jesko Dujmović , Helmholtz Center for Information Security (CISPA)
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Presentation: Slides
Conference: TCC 2022
Abstract: Incompressible encryption, recently proposed by Guan, Wichs and Zhandry (EUROCRYPT'22), is a novel encryption paradigm geared towards providing strong long-term security guarantees against adversaries with \emph{bounded long-term memory}. Given that the adversary forgets just a small fraction of a ciphertext, this notion provides strong security for the message encrypted therein, even if at some point in the future the entire secret key is exposed. This comes at the price of having potentially very large ciphertexts. Thus, an important efficiency measure for incompressible encryption is the message-to-ciphertext ratio (also called the rate). Guan et al. provided a low-rate instantiation of this notion from standard assumptions, and a rate-1 instantiation from indistinguishability obfuscation (iO). In this work, we propose a simple framework to build rate-1 incompressible encryption from standard assumptions. Our construction can be realized from e.g. the DDH and additionally the DCR or the LWE assumptions.
  title={Rate-1 Incompressible Encryption from Standard Assumptions},
  author={Pedro Branco and Nico Döttling and Jesko Dujmović},