Information Technology Journal1812-56381812-5646Asian Network for Scientific Information10.3923/itj.2005.146.150H. Al-HamamiAlaa Saad A. Al-Anni 2200542This research introduces a comprehensive solution for the passport authentication problem. It proposed to use an invisible watermark to be hidden in the passport's photo which is contain a digest value to be checked for the authentication. The construction of this watermark uses the idea of making a physical connection between the passenger characteristics (name) and passport's number and photo.The proposed system makes it easy to authenticate the passport in the originator country which issues the passport. The problem is how to authenticate the passport by another country (not the originator). Diffie-Hellman exchange key has been used by the proposed system to exchange a secret key for making the authentication process correct and simple. Each country will use its own secret key for developing its invisible watermark. The watermark retrieving process by any country will depend on its secret key and the exchanged of a secret key.]]>Johnson, N.F. and S. Jajodia,1998312634Provos, N. and P. Honeyman,2001Stefan, K. and A. Fabin,2000Wu, M. and B. Liu,19981998pp: 437441Al-Hamami, A. and S. Al-Ani,20051103106