Keep them out of enemy hands of secret documents can be a challenge, especially if the bad guys were used to stop and search you. Encryption is one thing, but it is the art of steganography (hide messages) which will ultimately save you a small, hot room without window.
This project shows you how to make a USB flash memory battery useful for storing secrets away from prying eyes. The battery can store a gigabyte of data, looks like a normal cell of AA alkaline batteries and indicates 1.5V if you test it. It will even be able to small electronic devices.
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