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International Symposium on Information Theory and its Applications

Quantum secret sharing between multiparty and multiparty against the attacks with single photons or EPR-pair

Atsushi Waseda, Takayuki TAKAGI, Masakazu Soshi, Atsuko Miyaji

Published Dec 1, 2008• 1 citation
Publisher

Abstract

We propose and evaluate new quantum secret sharing schemes (QSSS) for sharing a classical secret between two groups, group 1 and group 2. It is observed that the proposed scheme is secure against well-known attacks on QSSS, particularly attacks with single photons or EPR pairs.
DOI
10.1109/isita.2008.4895427

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We propose a scheme of quantum secret sharing between Alice's group and Bob's group with single photons and unitary transformations. In the protocol, one member in Alice's group prepares a sequence of single photons in one of four different states, while other members directly encode their information on the sequence of single photons via unitary operations; after that, the last member sends the sequence of single photons to Bob's group. Then Bob's, except for the last one, do work similarly. Finally the last member in Bob's group measures the qubits. If the security of the quantum channel is guaranteed by some tests, then the qubit states sent by the last member of Alice's group can be used as key bits for secret sharing. It is shown that this scheme is safe.
A multiparty quantum secret sharing scheme is proposed to utilize the magic properties of entanglement swapping. In this scheme, a set of (2N-1) EPR pairs is used to encode and distribute a secret message to (N-1) parties. Each secret message will be split into (N-1) packets. By performing the local unitary operations and entanglement swapping, each classical bit packet will be encoded secretly into Bell states so no subset of parties but their entire cooperation can read out the original secret message. The security of this proposed scheme is also considered.
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