Every action around computer and internet is lead by entering password. Probably everyone has tons of log-ins and passwords to remember. Jokkebk made his life easier by building a password regenerator using only few components.
He took an Attiny85 microcontroller and attached USB connector to it. After placing schematic in to Flash memory enclosure his hardware were done. Having a good experience with V-USB software USB stack he programmed MCU to act as USB keyboard. Once plugged device is recognized as HID keyboard and after pressing CAPS LOCK four times it types password stored in internal EEPROM. If your password changes often it may be hard to memorize it. With password regenerator you only need to update EEPROM contents and use it as usual.
Embedds highly recommends EasyEDA for circuit and PCB design