Paper 2022/884
On the Feasibility of Unclonable Encryption, and More
Abstract
Unclonable encryption, first introduced by Broadbent and Lord (TQC'20), is a one-time encryption scheme with the following security guarantee: any non-local adversary (A, B, C) cannot simultaneously distinguish encryptions of two equal length messages. This notion is termed as unclonable indistinguishability. Prior works focused on achieving a weaker notion of unclonable encryption, where we required that any non-local adversary (A, B, C) cannot simultaneously recover the entire message m. Seemingly innocuous, understanding the feasibility of encryption schemes satisfying unclonable indistinguishability (even for 1-bit messages) has remained elusive. We make progress towards establishing the feasibility of unclonable encryption. - We show that encryption schemes satisfying unclonable indistinguishability exist unconditionally in the quantum random oracle model. - Towards understanding the necessity of oracles, we present a negative result stipulating that a large class of encryption schemes cannot satisfy unclonable indistinguishability. - Finally, we also establish the feasibility of another closely related primitive: copy-protection for single-bit output point functions. Prior works only established the feasibility of copy-protection for multi-bit output point functions or they achieved constant security error for single-bit output point functions.
Metadata
- Available format(s)
-
PDF
- Category
- Foundations
- Publication info
- A minor revision of an IACR publication in CRYPTO 2022
- Keywords
- Unclonable Cryptography
- Contact author(s)
- qipengliu0 @ gmail com
- History
- 2022-07-07: approved
- 2022-07-06: received
- See all versions
- Short URL
- https://ia.cr/2022/884
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2022/884,
author = {Prabhanjan Ananth and Fatih Kaleoglu and Xingjian Li and Qipeng Liu and Mark Zhandry},
title = {On the Feasibility of Unclonable Encryption, and More},
howpublished = {Cryptology {ePrint} Archive, Paper 2022/884},
year = {2022},
url = {https://eprint.iacr.org/2022/884}
}
