Quantum Message Signature Scheme without an Arbitrator

A quantum message signature scheme based on quantum teleportation is presented. In this scheme, Alice prepares N-pair particles m and m´ in the same states which carry the quantum information while Bob generates N-pair particles a and b in EPR states, to each triplet composed of particles ai,bi and mi, Alice performs Bell-state measurement on mi and ai, to get signature, Bob compares the state of m´i and bi can verify the signature. This scheme does not rely on an arbitrator to verify the signature; however it has unconditional security and provides a higher efficiency in transmission.