Windows 11 25H2 is highly robust. From update

Microsoft Vos Windows 11 25H2 is highly robust. From Security Update in Key Points

Windows 11 has always been the boast of developers like Microsoft, its wide range of features and excellent performance (which many users see as untrue), and this time it was another pride Microsoft wanted to offer.

According to a report by the website, Neowin discussed how Microsoft has come forward, explaining the security that Windows 11 25H2 users will receive more after numerous security updates were released several times during the year 2025 (d. In the past 2568), specifically updated during November with the update of the Driver of the Working Log File System (CLFS) with the addition of Hash-based Message Authentication Code (HMAC) to confirm the authenticity of the data stored. The purpose is to prevent Tamper.

Microsoft has explained that the mechanism is a collaboration between secret key authentication and hash authentication, which is the processing of the data to obtain a set of data that can be considered a digital fingerprint of the data set. In other words, if the authentication compares the secret key to the value, it means that the authenticated set of data has not been modified. The key is only stored with the Administrators and SYSTEM accounts. If the authenticator finds an attempt to modify the data, it will block entry. Reach the log file or Log File immediately.

This protection comes from the fact that in the past, CLFS files with access rights to the system and applications on the machine at a high level were often subjected to hackers or malware. This weakness is used to access the system with a high level of license to the detriment of the system. But this security enhancement also requires additional authentication code. According to the source, file sizes require code storage:

512KB needs ~ 8192 bytes of additional space for identity confirmation coding storage.

1024KB needs ~ 12288 bytes additional space for identity confirmation coding storage.

10MB needs ~ 90112 bytes additional space for identity confirmation coding storage.

100MB needs ~ 57344 bytes additional space for identity confirmation coding storage.

4GB needs ~ 2101248 bytes additional space for identity confirmation coding storage.

In this regard, after the update, Microsoft has opened a 90-day learning period for IT departments, and administrators are familiar with the use of Log File authentication code.

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