<FONT face=Verdana>A strong blind quantum signature protocol was presented based on secret sharing. In this protocol
the three photons of each GHZ (Greenberger-Horne-Zeilinger) triplet are delivered to the message owner Alice
signatory Trent and verifier Bob respectively. Alice measures her photon to blind her message while Trent measures his photon to sign the blinded message
and then Bob verifies the signature according to the measuring results of his photon under the relationship of GHZ states. However
Bob’s actions are restricted by the quantum fingerprints and the audit program. Our protocol ensures that the signature is blind and the message owner is untraceable. Moreover
its security was not influenced by the computational resource of attackers.