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Windows 10 must be configured to prioritize ECC Curves with longer key lengths first.


Overview

Finding ID Version Rule ID IA Controls Severity
V-220805 WN10-CC-000052 SV-220805r569187_rule Medium
Description
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.
STIG Date
Windows 10 Security Technical Implementation Guide 2021-08-18

Details

Check Text ( C-22520r554900_chk )
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 (F-22509r554901_fix)
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