Abstract: In this paper, by employing a classical hash function and random numbers, an arbitrated quantum signature with single particles is put forward. One merit of this presented protocol is that the secret keys of signer and receiver can be reused. Since the receiver does not perform a further verification after the arbitrator verifies the validity of a signature, this scheme can stand against the disavowal attack. And it transmits less quantum bits. The security of the protocol is discussed briefly. It is shown that this protocol can effectively defense the assault of initiative or passiveness.

Key words: quantum optics, single particle, arbitrated quantum signature, quantum one-time pad, disavowal attack, Reusable key