I have some questions about using FLASH_DOWNLOAD_TOOL in production.
Start conditions:
1. We have a pre-signed and pre-encrypted binary for the bootloader, partition table, and factory app.
2. We are using 192-bit keys for flash encryption and secure boot.
3. We need to burn to eFuse some additional ...

Check this PR github.com/espressif/esp-idf/pull/2688
Authorization by client certificate looks more secure.