International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Limits on the Power of Garbling Techniques for Public-Key Encryption

Sanjam Garg
Mohammad Hajiabadi
Mohammad Mahmoody
Ameer Mohammed
DOI: 10.1007/978-3-319-96878-0_12 (login may be required)
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Presentation: Slides
Conference: CRYPTO 2018
Abstract: Understanding whether public-key encryption can be based on one-way functions is a fundamental open problem in cryptography. The seminal work of Impagliazzo and Rudich [STOC’89] shows that black-box constructions of public-key encryption from one-way functions are impossible. However, this impossibility result leaves open the possibility of using non-black-box techniques for achieving this goal.One of the most powerful classes of non-black-box techniques, which can be based on one-way functions (OWFs) alone, is Yao’s garbled circuit technique [FOCS’86]. As for the non-black-box power of this technique, the recent work of Döttling and Garg [CRYPTO’17] shows that the use of garbling allows us to circumvent known black-box barriers in the context of identity-based encryption.We prove that garbling of circuits that have OWF (or even random oracle) gates in them are insufficient for obtaining public-key encryption. Additionally, we show that this model also captures (non-interactive) zero-knowledge proofs for relations with OWF gates. This indicates that currently known OWF-based non-black-box techniques are perhaps insufficient for realizing public-key encryption.
Video from CRYPTO 2018
  title={Limits on the Power of Garbling Techniques for Public-Key Encryption},
  booktitle={Advances in Cryptology – CRYPTO 2018},
  series={Lecture Notes in Computer Science},
  author={Sanjam Garg and Mohammad Hajiabadi and Mohammad Mahmoody and Ameer Mohammed},