Event Brief
Dec 17, 2025 at 6:03 AM ET
Microsoft to Retire Weak RC4 Encryption Cipher
By The BriefBrief
Microsoft will discontinue the use of the RC4 cipher, a long-standing vulnerability in Windows security.
WHO: Microsoft
WHAT: Retirement of the RC4 encryption cipher
WHEN: Dec 16, 2025 at 7:00 PM ET
WHERE: Global
WHY: To enhance security and eliminate a long-standing vulnerability
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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