SIPRNet

The Secret Internet Protocol Router Network (SIPRNet) was "a system of interconnected computer networks used by the United States Department of Defense and the U.S. Department of State to transmit classified information (up to and including information classified SECRET) by packet switching over the TCP/IP protocols in a 'completely secure' environment". It also provides services such as hypertext document access and electronic mail. As such, SIPRNet is the DoD’s classified version of the civilian Internet.

Defense Information Systems Network

"In September 1991, OSD directed DISA to implement the Defense Information Systems Network (DISN). This is a consolidation of all service agency transmission infrastructures into two worldwide IP router networks, one for the sensitive but unclassified (N) environment, NIPRNET, and one for the secret (S) environment, SIPRNET." "NIPRNET (Non-Classified Internet Protocol Router Network) is used to exchange unclassified but sensitive information between 'internal DoD' user as well as providing user’s access to the Internet."

Distinction from other required secret networks

In describing "Specific Risks and Mitigation Strategies for Essential Operational Capabilities Supporting GWOT and Contingency Operations" considered so that "movement of organizations, functions, or activities from Fort Monmouth to Aberdeen Proving Ground (APG) will be accomplished without disruption of their support to the Global War on Terrorism (GWOT) or other critical contingency operations" a DoD report stated that "Certified facilities or services are required including Sensitive Compartmented Information Facilities (SCIF), IT connectivity to Defense Research and Engineering Network (DREN), Secret Internet Protocol Router Network (SIPR) connection, Joint Worldwide Intelligence Communications System (JWICS) connection, fully equipped and secured Top Secret/Sensitive Compartmented Information (TS/SCI) office, laboratory and fabrication facilities with uninterrupted worldwide Non-Classified Internet Protocol Routers (NIPR)/Secret Internet Protocol Routers (SIPR) and other services for sustained operations and program execution. A combination of redundant capabilities, split-based operations, and bridging mission requirements will be utilized so as to mitigate risk."

SIPRNet was allegedly one of the networks accessed by alleged whistleblower Bradley Manning, who allegedly leaked the video used in Wikileaks' Collateral murder as well as the source of the US diplomatic cables leaked by WikiLeaks in November 2010.

See also

NIPRNet

RIPR

Joint Worldwide Intelligence Communications System (JWICS)

Intellipedia

Protected Distribution System

Crisis Response Operations in NATO Operating Systems (CRONOS) is the NATO equivalent of SIPRNet

(source:wikipedia)