The department of Network Security and Internet Technologies has a long history of development in the field of computer networking since the seventies. The first packet-switched public network was developed and introduced as a public service by the end of eighties by our Institution. Since 1990, the de-partment’s focus has been Internet technology and applications in Hungary and abroad. One of the most important results was the development of a high-speed nation-wide research network for the Hungarian research and education community. Our development activity also includes the area of authentication and authorization infrastructures, including cloud systems and the use of semantic annotations as a technology for developing novel applications.