Windows code signing changes could affect older applications

Microsoft is updating how Windows signs its own software and warns that some third-party applications may stop working even when Windows still trusts the signature. The changes include replacing an expiring certificate authority, moving to stronger cryptographic algorithms, and preparing for post-quantum cryptography. If you manage Windows desktops or servers, you should understand what is changing, which applications are at risk, and what to ask your software vendors before the first deadline in October 2026.
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https://4sysops.com/archives/windows-code-signing-changes-could-affect-older-applications/