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Sensors 2009, 9(11), 9300-9331; doi:10.3390/s91109300

The Development of a Portable Hard Disk Encryption/Decryption System with a MEMS Coded Lock

* , * ,
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
* Authors to whom correspondence should be addressed.
Received: 4 August 2009 / Revised: 8 October 2009 / Accepted: 12 November 2009 / Published: 19 November 2009
(This article belongs to the Special Issue Modeling, Testing and Reliability Issues in MEMS Engineering - 2009)


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 Array). The MEMS coded lock with two couplers and two groups of counter-meshing-gears (CMGs) are fabricated by a LIGA-like process and precision engineering method. The whole prototype was fabricated and tested. The test results show that the user’s password could be correctly discriminated by the MEMS coded lock, and the AES encryption module could get the key from the MEMS coded lock. Moreover, the data in the hard-disk could be encrypted or decrypted, and the read-write speed of the dataflow could reach 17 MB/s in Ultra DMA mode.
Keywords: portable hard disk encryption/decryption system; MEMS coded lock; FPGA portable hard disk encryption/decryption system; MEMS coded lock; FPGA
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhang, W.; Chen, W.; Tang, J.; Xu, P.; Li, Y.; Li, S. The Development of a Portable Hard Disk Encryption/Decryption System with a MEMS Coded Lock. Sensors 2009, 9, 9300-9331.

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