My purpose is to use this tool as a password manager with KeePassXC, and also INTERLOCK (file encryption front end).

• 1. check microSD-compatibility
• 2. [burn] Void Linux image into microSD card

I chose a Samsung microSD and installed Void Linux as described in their wiki. I choose Void Linux, but there are other available image.

We can use USB to TTL cable to connect to USB killer serial port. I solder a header in USB killer and use pins 1,5,6 to connect a USB to TTL adapter with silicon CP210x chipset and specific drivers. To connect in macOS use the next command:

screen /dev/tty.SLAB_USBtoUART 115200

The Void Linux image comes with predefined ipv4 address 10.0.0.1, so set your IP address to 10.0.0.2 and connect to your USB killer.

Now you can log in with

ssh 10.0.0.1 -l killer

Setup is done with Ansible

• setup ssh
• install keepassxc, etckeeper and standard utilities

We need the RNDIS/Ethernet Gadget interface in the macOS Network Preferences.

To share macOS internet access with the USB killer device, you can:

option 1

sudo ./scripts/connection_share.sh

option 2

• set USB killer IP to 192.168.2.X/24 and gateway 192.168.2.1
• in macOS set the IP address of RNDIS/Ethernet Gadget interface to 192.168.2.1
• finally, set Enable Internet Sharing to ON in System Preferences

To share Linux internet connection with the USB killer device, just run:

sudo ./scripts/linux_connection_share.sh