Abstract: The existing methods for verifying 3D object authenticity have some problems that the identity of 3D object is not bound to itself and difficult to verify．According to the problems,this paper proposed a signature algorithm suitable for 3D physical object,provided the design idea,signature generation and signature verification algorithm of 3D object signature algorithm．The spin image and ICP algorithm are used to match the surface of signature model and the testing model relatively in the coarse matching and fine matching phase thereby improving the accuracy of verification．The si-mulation for the designed 3D signature algorithm was carried out.The obtained iterate error and match rate show that the algorithm can differentiate between the original and counterfeit model,thereby demonstrating the validity of algorithm.

Key words: 3D object signature,Surface registration,Spin image,Iterative closest point