Sun Tanfeng, was born in 1975. He had obtained PHD degree of Communication and Information System in Jilin University in China in 2003. Now he is working as an assistant professor at Shanghai Jiao Tong University in China. His research interests include image / video processing, cryptography and watermarking, and image/video content authentication. Jiang Xinghao , was born in 1976. He earned PHI) degree of electronic science and technology specialty from Zhejiang University in Hangzhou of China in 2003. He earned Professor title in Shanghai Jiaotong University in 2006. His research includes video content security and authentication, PMI, security identity authentication, information hiding and watermarking.