| 1 | = Introduction = |
| 2 | |
| 3 | Different Windows versions have different kernel-mode signing options: |
| 4 | |
| 5 | * Windows 7/8/8.1/Server 2012r2 |
| 6 | * Cross-signing |
| 7 | * WHQL-certified (HCR) |
| 8 | * Windows 10 desktop |
| 9 | * Attestation signing |
| 10 | * WHQL-certified (HLK) |
| 11 | * Windows Server 2016/2019 |
| 12 | * WHQL-certified (HLK) |
| 13 | |
| 14 | According to practical testing done by [https://www.wintun.net/ wintun] developers it is possible to cover all Windows 10 platforms with the following HLK clients: |
| 15 | |
| 16 | * Windows Server 2019 (64-bit) |
| 17 | * Windows Server 2019 core (64-bit) |
| 18 | * Windows 10 desktop (32-bit) |
| 19 | |
| 20 | Wintun was able to pass HLK testing without any physical HLK clients. But due to its narrower scope it had to pass much fewer HLK tests (~50 in total) than tap-windows6. |