Duplicates also Matter! Towards Secure Deletion on Flash-based Storage Media by Removing Duplicates
Niusen Chen, Bo Chen · Proceedings of the 2022 ACM on Asia Conference on Computer and Communications Security · 2022
Flash memory has been used extensively as external storage of smartphones, tablets, IoT devices, laptops, etc. Therefore, more and more sensitive or even mission critical data are stored in flash and, once the data turn obsolete, securely deleting them is necessary for both regulation compliance and privacy protection. Traditional secure deletion on flash memory mainly focuses on sanitizing data. However, unique nature of flash memory may cause various data ''remnants'' and, even though the data are removed, the remnants may be utilized by the adversary to recover the deleted data, compromising the secure deletion guarantee.