Secure official document mail systems for office automation

Electronic mail or email system is by far one of the most widely used applications in the office automation systems. However, due to the lack of communication security services and the impose of export controls, sensitive official document of government organizations could not be transited securely over open networks using off-the-shell email systems. In this paper, we present the result of a joint effort between the Chunghwa Telecom and the Ministry of Justice Investigation Bureau of Taiwan to integrate security services into existing official document mail systems.