| With the rapidly developing of USB technology and flash memory technology, a kind of product named usb flash disk comes out, which is based on the two technologies. It can storage any data file and transport them between computers. It has mass storage capability, fast write/read speed and need no extern power supply during work, hot-plugging, legerity, easy to use. Some operation system such as Windows Me/2000/XP, Mac OS 9.x/Mac OS X/Linux2.4x etc. already have driver for it. So it can be used in these operation systems without installing new drivers.With usb flash disk is used more and more widely,it also cause security problem. So we develop a new security usb flash disk system and windows program for it. Every time we use this usb flash disk, we have to verify our finger print first. Only when we pass the verification, the security usb flash disk can be used. And when we read/write on the disk, the firmware will decrypt/encrypt the data using AES-128 arithmetic. The windows program provides user a good HMI and notifies firmware for finger print verification. During these operations, the security of usb flash disk can be guaranteed.According the purpose of design, our system uses OKI-ML69Q6203 as main control chipset. This chipset is based on ARM946E, integrates a USB2.0 chipset, has a 512k flash in it; use AuthenTec's AES2510 as finger verification chipset. This chipset is base on the"Trueprint"technology and can direct scan finger's corium layer. So it can sense the finger putting on it is true or fake. Our flash chipset uses Samsung's K9F5608U0A. It has 32 Mb capacities, fast write/read speed, long life for using. This article deeply research USB2.0 protocol, USB MASS STORAGE protocol especially BULK ONLY transport protocol and UFI protocol and introduce how to develop such finger print usb flash disk. It discuss how to make a usb flash disk to be considered as a cd-rom and a disk by operation system and prevent usb flash disk from operating by systerm without passing finger print verification.Be limited by time and energy, the design no finish perfectly and some parts of it need mort thorough research, such as, adding more function of windows program, increasing data transport speed of usb flash disk etc. |
