Paper 2024/511
A Black-box Attack on Fixed-Unitary Quantum Encryption Schemes
Abstract
We show how fixed-unitary quantum encryption schemes can be attacked in a black-box setting. We use an efficient technique to invert a unitary transformation on a quantum computer to retrieve an encrypted secret quantum state $\ket{\psi}$. This attack has a success rate of 100% and can be executed in constant time. We name a vulnerable scheme and suggest how to improve it to invalidate this attack. The proposed attack highlights the importance of carefully designing quantum encryption schemes to ensure their security against quantum adversaries, even in a black-box setting.
Metadata
- Available format(s)
- Category
- Attacks and cryptanalysis
- Publication info
- Preprint.
- Keywords
- quantum cryptographyblack-box attackquantum cryptanalysisquantum circuits
- Contact author(s)
-
cezary pilaszewicz @ gmail com
lea muth @ fu-berlin de
marian margraf @ fu-berlin de - History
- 2024-04-01: approved
- 2024-03-31: received
- See all versions
- Short URL
- https://ia.cr/2024/511
- License
-
CC0
BibTeX
@misc{cryptoeprint:2024/511, author = {Cezary Pilaszewicz and Lea R. Muth and Marian Margraf}, title = {A Black-box Attack on Fixed-Unitary Quantum Encryption Schemes}, howpublished = {Cryptology {ePrint} Archive, Paper 2024/511}, year = {2024}, url = {https://eprint.iacr.org/2024/511} }