SIPRNet

The SIPRNet (Secret Internet Protocol Router Network) is a system of interconnected computer networks used by the U.S. Department of Defense to transmit classified information (up to and including information classified SECRET//NOFORN) by packet switching over the TCP/IP protocols in a completely secure environment. It also provides services such as hypertext documents and electronic mail. In other words, the SIPRNet is the DoD’s classified version of the civilian Internet and it (and its TOP SECRET/SCI counterpart known as JWICS and its TOP SECRET counterpart known as NSANET) are revolutionizing the way classified information is disseminated to consumers.

Except for existing within a secure environment, the SIPRNet is virtually indistinguishable from the Internet to the user. Among its many features, computers cleared for SIPRNET access connect to the network via secure dial-up or LAN connections, access web pages written in standard HTML using a normal web browsers such as Internet Explorer or Netscape Navigator, can upload and download files via FTP connections, and can send or receive email messages through SMTP services using email programs such as Microsoft Outlook.

NIPRNet: the Non-secure Internet Protocol Router Network (NIPRNet) provides seamless interoperability for unclassifed combat support applications, as well as controlled access to the Internet. Direct connection data rates range from 56 kbit/s to 155 Mbit/s. Remote dial-up services are available up to 56 kbit/s.

SIPRNet: The Secret IP Router Network (SIPRNet) is DoD’s largest interoperable command and control data network, supporting the Global Command and Control System (GCCS), the Defense Message System (DMS), collaborative planning and numerous other classified warfighter applications. Direct connection data rates range from 56 kbit/s to 155 Mbit/s for the NIPRNet, and up to 45 Mbit/s for the SIPRNet. Remote dial-up services are also available, ranging from 19.2 kbit/s on SIPRNet to 56 kbit/s on NIPRNet.

SIPRNet hosts a forum called CAVNET which is used in Iraq to share TTP [Tactic, Technique, Procedures] data.