How does the executCmd.aspx page verify authentication and execute commands?

The `execCmd.aspx` page uses the `Page_Load` method to capture two POST form parameters: `data1` (Auth Key) and `data2` (Base64-encoded command). It compares `data1` against a hardcoded Base64 string (e.g., `UGFzc3dvcmQxMjM0NTY3ODk`); if mismatched, it returns nothing. If verified, it decodes `data2`, runs the command via `cmd.exe /c`, and returns the output as a Base64-encoded string. This design ensures that only authorized scripts can interact with the webshell, as detailed in the article's script development section.