Here is an open hardware flash drive with a hidden security feature to protect your files. If you plug your Ovrdrive normally, it appears blank. But if you quickly plug it in 3 times in a row, you will be able to access your data. It has a removable enclosure, so you can access the board.
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I Made a Secure USB Drive for Journalists and Hardware Hackers!
This flash drive has an ATtiny24A microcontroller with 8GB storage. It can be programmed via Arduino. Its hardware and software are all open source.
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