Affiliations: knowledge Information Security Research Department,
ETRI, 161 Gajeong-dong, Yuseong-gu, Daejeon, 305–700, Korea | Department of Computer and Information Science,
Sunmoon University, Asan, Chungnam 336–708, Korea | Department of Computer and Information Science, Korea
University, Jochiwon, Chungnam 339–700, Korea | School of Games, Hongik University, Jochiwon, ChungNam
339–701, Korea
Abstract: As the mobile appliance is applied to many ubiquitous services and
the importance of the information stored in it is increased, the security issue
to protect the information becomes one of the major concerns. However, most
previous researches focused only on the communication security, not the storage
security. Especially, a flash memory whose operational characteristics are
different from those of HDD is used increasingly as a storage device for the
mobile appliance because of its resistance to physical shock and lower power
requirement. In this paper, we propose a flash memory management scheme
targeted for guaranteeing the data integrity of the mobile storage. By
maintaining the old data specified during the recovery window, we can recover
the old data when the mobile appliance is attacked. Also, to reduce the storage
requirement for the recovery, we restrict the number of versions to be copied,
called Degree of Integrity (DoI). Especially, we consider both the reclaim
efficiency and the wear leveling which is a unique characteristic of the flash
memory. Based on the performance evaluation, we confirm that the proposed
scheme can be acceptable to many applications as a flash memory management
scheme for improving data integrity.
Keywords: Mobile storage, flash memory, data integrity
