What is a SCIF? Inside the high-security rooms that keep military secrets safe — unlike a Signal chat

Carlos Fyfe/The White House/Handout via REUTERS

• Trump officials mistakenly included a journalist in a Signal chat about strikes on Houthi rebels.
• High-security rooms called SCIFs are used for classified discussions to prevent information leaks.
• The breach highlights the risks of using encrypted apps for sensitive national security talks.

As digital surveillance, hacking...