Microsoft explains why Windows 11 25H2 got twice as heavy due to a key security update

[Parkinsond]

With the November 2025 patch, Microsoft imposed a new security mitigation for the Common Log File System (CLFS) driver in updates to Windows 11 25H2 and Server 2025.
This is a crucial update as it adds a hash-based message authentication code (HMAC) to CLFS logfiles in order to strengthen protection against tampering.

If you are wondering, a Hash-based Message Authentication Code (HMAC) is a cryptographic mechanism used to verify message integrity and authenticity by combining a secret key with a hash function.
The sender computes a hash value over the data and transmits both the data and the HMAC.
The receiver then, using the same secret key, recomputes the hash and checks for a match.
This match is basically what ensures there is no tamper detection.

https://www.neowin.net/news/microsoft-explains-why-windows-11-25h2-got-twice-as-heavy-due-to-a-key-security-update/

 

[Divine_Barakah]

"twice as heavy" is exaggerating.

 

[Parkinsond]

"twice as heavy" is exaggerating.

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