> For the complete documentation index, see [llms.txt](https://gitbook-88.gitbook.io/ctf-writeup/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook-88.gitbook.io/ctf-writeup/2020/2020-actf/include.md).

# Include

这题考察的是文件包含的php协议，一句话解决：

```
php://filter/read=convert.base64-encode/resource=flag.php
```