この記事は会員限定です。会員登録すると全てご覧いただけます。 Microsoftは2025年12月3日（現地時間）、Kerberos認証において、暗号方式RC4（Rivest Cipher 4）を段階的に廃止する方針を公式ブログで明らかにした。 発表によれば、2026年半ばまでに「Windows Server 2008 ...

Microsoft will enforce stronger Kerberos encryption in April 2026, removing RC4 support and potentially impacting enterprise setups.

Microsoft is officially moving to shut the door on RC4 - a legacy cryptographic cipher that has quietly persisted inside Windows authentication environments for decades - and forcing organizations to ...

In the Windows Release Health Message Center, Microsoft explains that the software fix for a security vulnerability in Kerberos initiates the hardening of Kerberos with RC4. The vulnerability itself ...

In April, Microsoft plans to start the next phase in the process of phasing out insecure RC4 encryption from Kerberos. Authentication in Active Directory is intended to become significantly more ...