Enabling SMB Signing

To require SMB signing, use the Registry Editor to create or assign the following Registry key values: NOTE: SMB signing is only available on Windows 98, Windows NT, and Windows 2000.
SMB signing will cause a 10-15% performance hit.

HKLM\System\CurrentControlSet\Services\LanManServer\Parameters

Value Name: EnableSecuritySignature
Data Type: REG_DWORD
Data: 0 (disable), 1 (enable)

NOTE: The default is 0 (disable)

Name: RequireSecuritySignature
Type: REG_DWORD
Value: 0 (disable), 1 (enable)

NOTE: The default is 0 (disable)