The system enforces modern KSP/CNG. This is the secure, intended state that prevents attackers from exploiting legacy SHA1 hash collisions to bypass signatures.
So a plausible interpretation is:
In October 2025, Microsoft released security updates (such as and KB5066782 ) aimed at addressing vulnerabilities like CVE-2024-30098 . These updates changed how Windows handles RSA-based smart card certificates. disablecapioverrideforrsa
— Older Windows cryptographic API (pre-CNG). Sometimes applications or security libraries allow overriding default cryptographic providers, key storage, or signature verification behavior. A flag like this might be used to force the system not to replace the normal RSA implementation with a custom one (e.g., from a hardware security module or a third-party CSP).
DisableCapIOOverrideForRSA is a specific configuration setting found within the VMware Horizon (formerly Horizon View) environment. This setting is relevant to system administrators managing Virtual Desktop Infrastructure (VDI) and determines how smart card authentication and certificate handling are processed during user logins. The system enforces modern KSP/CNG
is a specialized registry configuration within the Windows operating system that dictates how the system handles RSA cryptographic operations. Specifically, it manages the interaction between legacy CryptoAPI (CAPI) and the newer Cryptography Next Generation (CNG) framework. The Shift from CAPI to CNG
Proprietary or "black-box" legacy software may crash or return errors when it detects a CNG-provided RSA key instead of a native CAPI key. These updates changed how Windows handles RSA-based smart
In rare scenarios, specific certifications (like older FIPS validations) might be tied to a specific CAPI implementation rather than the CNG equivalent. Security Implications
Cryptographic Service Provider (CSP) for RSA-based smart card operations. While this improves security, it caused many legacy 32-bit applications and smart card drivers to fail. Temporary Workaround If your applications can no longer access smart card private keys (often resulting in "Invalid provider type specified" errors), you can manually set a registry override to re-enable legacy CAPI/CSP behavior: Registry Path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Calais Value Name: DisableCapiOverrideForRSA Type: REG_DWORD Value Data: 0 (This disables the "override" and reverts to legacy behavior) 11 sites DisableCapiOverrideForRSA registry removal impact on ... Mar 26, 2026 —