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Check: WN10-CC-000052

Microsoft Windows 10 STIG: WN10-CC-000052 (in versions v3 r2 through v1 r10)

Title

Windows 10 must be configured to prioritize ECC Curves with longer key lengths first. (Cat II impact)

Discussion

Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. By default Windows uses ECC curves with shorter key lengths first. Requiring ECC curves with longer key lengths to be prioritized first helps ensure more secure algorithms are used.

Check Content

If the following registry value does not exist or is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002\ Value Name: EccCurves Value Type: REG_MULTI_SZ Value: NistP384 NistP256

Fix Text

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> SSL Configuration Settings >> "ECC Curve Order" to "Enabled" with "ECC Curve Order:" including the following in the order listed: NistP384 NistP256

Additional Identifiers

Rule ID: SV-220805r971535_rule

Vulnerability ID: V-220805

Group Title: SRG-OS-000120-GPOS-00061

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CCIs

CCIs tied to check.

Number	Definition
CCI-000803	Implement mechanisms for authentication to a cryptographic module that meet the requirements of applicable laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
IA-7	Cryptographic Module Authentication