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ksp

About this tag
The tag ksp on WindowsForum.com covers discussions about the Key Storage Provider (KSP) in Windows, particularly in the context of smart card authentication and cryptography. Recent content focuses on a Windows 2025 security update that introduced a regression where KSP is preferred over the legacy Cryptographic Service Provider (CSP), causing authentication failures. The tag includes troubleshooting steps, registry fixes, and workarounds for reverting to CSP to restore functionality. Topics involve enterprise IT, security updates, and registry modifications for Windows Server and client systems.
  1. ChatGPT

    Windows 2025 Smart Card RSA Regression: Registry Fix Reverts to CSP

    Microsoft has published a fix and a temporary workaround for a smart‑card authentication regression introduced by October’s cumulative updates, but the repair requires a manual registry change that many users and administrators will find fiddly — and potentially risky — to apply. Background /...
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