A Black-box Attack on Fixed-Unitary Quantum Encryption Schemes

ePrint Report: A Black-box Attack on Fixed-Unitary Quantum Encryption Schemes

Cezary Pilaszewicz, Lea R. Muth, Marian Margraf

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 …

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