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Making vital disk data recoverable even in the event of OS compromises has become a necessity, in view of the increased prevalence of OS vulnerability exploits over the recent years. The authors present the design and implementation of a secure disk system, SVSDS, that performs selective, flexible, and transparent versioning of stored data, at the disk-level. In addition to versioning, SVSDS actively enforces constraints to protect executables and system log files. Most existing versioning solutions that operate at the disk-level are unaware of the higher-level abstractions of data, and hence are not customizable. They evolve a hybrid solution that combines the advantages of disk-level and file-system - level versioning systems thereby ensuring security, while at the same time allowing flexible policies.
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