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A critical Microsoft security update designed to enhance cryptography has instead created enterprise-wide disruptions. The transition from CSP to KSP has triggered failures in smart card authentication, IIS connectivity, and recovery mode devices across multiple Windows versions.

Enterprise Systems Crippled by Security Update

A recent Microsoft Windows security update intended to strengthen cryptographic protections has instead created significant operational challenges for enterprise IT departments, according to widespread reports. The October 2025 update, designated KB5066835, was meant to transition systems from the older Cryptographic Services Provider (CSP) to the more secure Key Storage Provider (KSP) but has triggered multiple system failures affecting core business functions.