> For the complete documentation index, see [llms.txt](https://docs.hoola.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hoola.vn/v5.0.0/huong-dan-cai-dat-website/huong-dan-cai-dat-he-thong/bao-mat-hai-lop.md).

# Bảo mật hai lớp