Joint Worldwide Intelligence Communications System

The Joint Worldwide Intelligence Communication System (JWICS, /ˈdʒeɪwɪks/ JAY-wiks) is the United States government's secure intranet for the storage of top secret and sensitive compartmented information, primarily for use in intelligence. It is the most secure of three separate router networks operated by the U.S. government for the handling and transmission of classified materials and is designed to safeguard the most sensitive materials. Operated by the Department of Defense, JWICS superseded DSNET2 and DSNET3, the Top Secret and SCI levels of the earlier Defense Data Network.

Most of the publicly known compromises of JWICS have been perpetrated by leakers who had legitimate authorization to access the system at the time of their disclosures, including: Chelsea Manning in 2010, Edward Snowden in 2013, and Jack Teixeira in 2023. Because of the sensitivity of its contents, JWICS remains a frequent subject of discussion and concern surrounding the United States' vulnerability to cyber threats.

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