Physics – Quantum Physics
Scientific paper
2009-02-23
full version of Advances in Cryptology - CRYPTO 2009, LNCS 5677, pages 408-427
Physics
Quantum Physics
21 pages; editorial change (reorganizing of several subsections in new section 5 about "extensions and generalizations"); adde
Scientific paper
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.
Damgaard Ivan
Fehr Serge
Lunemann Carolin
Salvail Louis
Schaffner Christian
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