Abstract
A quantum identity authentication scheme based on ping-pong technique without entanglements is proposed. It can verify the legitimate user's identity and update the initial authentication key for reuse. The security of the proposed scheme is extensively analyzed and accordingly confirmed in the case of general individual attacks. The present scheme owns high efficiency due to the use of single-particle states in a two-way quantum channel. Moreover, the scheme is economical and feasible with present-day technique.
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