Hidden USB Screwdriver
Problems would be that it is small and forgetting where to put it or having someone find it around the house something you do. With this design, it would be in plain sight where no one would expect it to be, and be able to hide it from anyone if you are trying to hide personal info.
Supplies
First, the screwdriver dimensions are, length is about 8-11/32” inches and, 3.5mm.in width, its dimensions would be 8-11/32 X 3.5mm. The second would be the USB its dimensions would be about 0.34 inches in height, 0.48 inches in width, and 1.75 inches in depth. The third thing would be a computer. And the final thing would be a website to make your design something like Onshape.
First, get the flathead screwdriver if not 3D print it to make an easier process because if you don't have one you are going to need some tools to cut open the screwdriver from the bottom and make a 1.80-inch hole depth inside the screwdriver. Also, it's better if it was 3d printed because you could get the exact measurements for the screwdriver and don't have to cut anything.
The second would be the USB, you are going to have to get one that can fit inside the screwdriver so it going to be pretty small. For mine, the USB would be 0.34 inches in height, 0.48 inches in width, and 1.75 inches in depth. To fit perfectly inside the screwdriver.