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Journal of Optics B Quantum and Semiclassical Optics

Secret-message sharing via direct transmission

Kamil Brádler, Miloslav Du ek

Published Nov 3, 2003• 8 citations
Publisher

Abstract

Two new protocols for secret-information splitting among many participants are proposed. One of them uses only bipartite entangled states (Bell states) and the other one multi-partite entangled states. We prove their security against the family of rather general intercept–resend attacks and discuss the possibility of an experimental realization.

DOI
10.1088/1464-4266/6/1/011

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Two new protocols for secret-information splitting among many participants are proposed. One of them uses only bipartite entangled states (Bell states) and the other one multi-partite entangled states. We prove their security against the family of rather general intercept–resend attacks and discuss the possibility of an experimental realization.
Abstract In this paper, we propose an efficient multiparty quantum direct secret sharing scheme based on Bell state and Bell measurements. In our scheme, the secret information can be directly encoded into the second particles of Bell states through the local unitary operations. In order to increase the number of participants, we use the controlled-NOT gate to produce the final multipartite entangled states. In the reconstruction phase, each participant performs Bell measurements for their particles and obtains the final key strings. Furthermore, they cooperate to recover the secret information. In addition, we give a concrete example with four participants to demonstrate more clearly the integrity of our scheme. Finally, we demonstrate that our protocol can resist both collusion attack and intercept-and-resend attack.
A multi-partite-controlled quantum secret sharing scheme using several non-orthogonal entanglement states is presented with unconditional security. In this scheme, the participants share the secret quantum state by exchanging the secret polarization angles of the disordered travel particles. The security of the secret quantum state is also guaranteed by the non-orthogonal multi-partite-controlled entanglement states, the participants' secret polarizations, and the disorder of the travelling particles. Moreover, the present scheme is secure against the particle-number splitting attack and the intercept-and-resend attack. It may be still secure even if the distributed quantum state is embedded in a not-so-weak coherent-state pulse.