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Sensors 2009, 9, 9300-9331; doi:10.3390/ OPEN ACCESS sensors ISSN 1424-8220 /journal/sensors Article The Development of a Portable Hard Disk Encryption/Decryption System with a MEMS Coded Lock Weiping Zhang *, Wenyuan Chen *, Jian Tang, Peng Xu, Yibin Li and Shengyong Li Key Laboratory for Thin Film and Microfabrication of Ministry of Education, National Key Laboratory of Nano/Micro Fabrication Technology, Research Institute of Micro/Nano Technology, Shanghai Jiao Tong University, Shanghai 200240, China; E-Mails: chenwy@ (W.C.); SJTUtj@126.com (J.T.); xpsjtu@ (P.X.); ybsjtu@ (Y.L.); lshyong@ (S.L.) * Authors to whom correspondence should be addressed; E-Mails: Zhangwp@ (W.Z.); Chenwy@ (W.C.). Received: 4 August 2009; in revised form: 8 October 2009 / Accepted: 12 November 2009 / Published: 19 November 2009 Abstract: In this paper, a novel portable hard-disk encryption/decryption system with a MEMS coded lock is presented, which can authenticate the user and provide the key for the AES encryption/decryption module. The portable hard-disk encryption/decryption system is composed of the authentication module, the USB portable hard-disk interface card, the ATA protocol command decoder module, the data encryption/decryption module, the cipher key management module, the MEMS coded lock controlling circuit module, the MEMS coded lock and the hard disk. The ATA protocol circuit, the MEMS control circuit and AES encryption/decryption circuit are designed and realized by FPGA(Field Programmable Gate