Abstract
Ensuring confidentiality of sensitive data is of paramount importance, since data leakage may not only endanger data owners’ privacy, but also ruin reputation of businesses as well as violate various regulations like HIPPA and Sarbanes-Oxley Act. To provide confidentiality guarantee, the data should be protected when they are preserved in the personal computing devices (i.e., confidentiality during their lifetime); and also, they should be rendered irrecoverable after they are removed from the devices (i.e., confidentiality after their lifetime). Encryption and secure deletion are used to ensure data confidentiality during and after their lifetime, respectively.This work aims to perform a thorough literature review on the techniques being used to protect confidentiality of the data in personal computing devices, including both encryption and secure deletion. Especially for encryption, we mainly focus on the novel plausibly deniable encryption (PDE), which can ensure data confidentiality against both a coercive (i.e., the attacker can coerce the data owner for the decryption key) and a non-coercive attacker.
Highlights
Modern computing devices are increasingly used to process sensitive or even mission critical data
The data confidentiality should be ensured during their lifetime, and after their lifetime
We summarize secure deletion approaches in various storage media including hard disk drives (HDDs) and NAND flash memory
Summary
Modern computing devices (e.g., desktops, laptops, smart phones, tablets, wearable devices) are increasingly used to process sensitive or even mission critical data. To protect confidentiality of the data deleted from a computing device, the deleted data should be made completely unrecoverable This is ensured by carefully over-writing the storage medium storing the data using garbage information (Joukov and Zadok 2005; Wei et al 2011; Garfinkel and Shelat 2003; Sun et al 2008; Gutmann 1996) or deploying encryption using ephemeral keys (Perlman 2005a, b, Geambasu et al 2009, Tang et al 2012, Reardon et al 2012, Zarras et al 2016).
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