From Wikipedia: Starting with Windows 8 and Windows Server 2012 Microsoft removed the Elephant Diffuser from the BitLocker scheme for no declared reason.[47] D

From Wikipedia: Starting with Windows 8 and Windows Server 2012 Microsoft removed the Elephant Diffuser from the BitLocker scheme for no declared reason.[47] Dan Rosendorf's research shows that removing the Elephant Diffuser had an "undeniably negative impact" on the security of BitLocker encryption against a targeted attack.[48] Microsoft later cited performance concerns, and noncompliance with the Federal Information Processing Standards (FIPS), to justify the diffuser's removal.[49] Starting with Windows 10 version 1511, however, Microsoft added a new FIPS-compliant XTS-AES encryption algorithm to BitLocker.[6]