JISE

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Journal of Information Science and Engineering, Vol. 26 No. 1, pp. 27-38

An Efficient Secure Deletion Scheme for Flash File Systems

JAEHEUNG LEE, SANGHO YI^**, JUNYOUNG HEO^***, HYUNGBAE PARK⁺, SUNG Y. SHIN⁺⁺ AND YOOKUN CHO
School of Computer Science and Engineering
Seoul National University
Seoul, 151-172 Korea
E-mail: {jhlee; shyi; ykcho}@ssrnet.snu.ac.kr
⁺Department of Computer Science and Electrical Engineering
University of Missouri at Kansas City
Kansas City, MO 64110, U.S.A.
E-mail: HPark@umkc.edu
⁺⁺Computer Science Department
South Dakota State University
Brookings, SD 57007, U.S.A.
E-mail: sung.shin@sdstate.edu
^***Department of Computer Engineering
Hansung University
Seoul, 136-792 Korea
E-mail: jyheo@hansung.ac.kr

Secure deletion for flash file systems is essential for enhancing the security of embedded systems. Due to the characteristics of flash memory, existing secure deletion schemes cannot be directly adapted to flash file systems. In this paper, we propose an efficient secure deletion scheme for flash file systems. It encrypts a file’s data and stores all keys of the file in the same block. This ensures that a single erase operation is sufficient to securely delete a file. Experimental results show that our scheme significantly reduces secure deletion overhead compared with the simple encryption scheme.

Keywords: secure deletion, file system, flash memory, encryption, key management

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