Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-220936 | WN10-SO-000190 | SV-220936r971535_rule | CCI-000803 | medium |
| Description | ||||
| Certain encryption types are no longer considered secure. This setting configures a minimum encryption type for Kerberos, preventing the use of the DES and RC4 encryption suites. | ||||
| STIG | Date | |||
| Microsoft Windows 10 Security Technical Implementation Guide | 2025-02-25 | |||
Details
Check Text (C-220936r971535_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\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters\
Value Name: SupportedEncryptionTypes
Value Type: REG_DWORD
Value: 0x7ffffff8 (2147483640)
Fix Text (F-22640r555294_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Configure encryption types allowed for Kerberos" to "Enabled" with only the following selected:
AES128_HMAC_SHA1
AES256_HMAC_SHA1
Future encryption types