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Pauli Center for Theoretical Studies

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ETH Zurich (Computer Science and Physics Department)

Quantum Science and Technology

CQT Singapore

QAP European Project

Sandia National Laboratories

Institute for Quantum Computing

id Quantique

Improving the security of quantum protocols via commit-and-open

Carolin Lunemann, Aarhus University
joint work with Ivan Damgård, Serge Fehr, Louis Salvail, and Christian Schaffner

We consider two-party quantum protocols starting with a transmission of some random BB84 qubits followed by classical messages. We show a general compiler, improving the security of such protocols: if the original protocol is secure against an "almost honest" adversary, then the compiled protocol is secure against an arbitrary computationally bounded (quantum) adversary. The compilation preserves the number of qubits sent and the number of rounds up to a constant factor. The compiler also preserves security in the bounded-quantum-storage model (BQSM), so if the original protocol was BQSM-secure, the compiled protocol can only be broken by an adversary who has large quantum memory and large computing power. This is in contrast to known BQSM-secure protocols, where security breaks down completely if the adversary has larger quantum memory than expected. We show how our technique can be applied to quantum identification and oblivious transfer protocols.