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ERROR_SXS_PROTECTION_PUBLIC_KEY_TOO_SHORT
ERROR_SXS_PROTECTION_PUBLIC_KEY_TOO_SHORT — The public key associated with a protected assembly is too short for the required protection policy.
Windows rejected the assembly protection metadata because the public key does not meet the security requirements of the platform. This is a signing or packaging compatibility issue, not a normal runtime dependency error.
The safe resolution is to use a current, correctly signed package from the publisher or Windows servicing source. Do not weaken signature policy or alter the catalog manually.
What to check
- Identify whether the affected assembly belongs to Windows or to a third-party application.
- For third-party content, obtain an updated installer from the vendor.
- For an operating-system component, use the Windows servicing repair workflow and check for current servicing updates.
Microsoft: Repair a Windows image
Microsoft: About Side-by-Side assemblies
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