Quantum asymmetric cryptography with symmetric keys

Abstract

Based on quantum encryption, we present a new idea for quantum public-key cryptography (QPKC) and construct a whole theoretical framework of a QPKC system. We show that the quantum-mechanical nature renders it feasible and reasonable to use symmetric keys in such a scheme, which is quite different from that in conventional public-key cryptography. The security of our scheme is analyzed and some features are discussed. Furthermore, the state-estimation attack to a prior QPKC scheme is demonstrated.

8 pages, 1 figure, Revtex4

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• Indistinguishability and semantic security for quantum encryption scheme
• Quantum public-key algorithms to encrypt and authenticate quantum messages with information-theoretic security