Decoupling data-at-rest encryption and smartphone locking with wearable devices

摘要: Abstract Smartphones store sensitive and confidential data, e.g., business related documents or emails. If a smartphone is stolen, such data are at risk of disclosure. To mitigate this risk, modern smartphones allow users to enable encryption, which uses locking password protect the encryption key. Unfortunately, either do not lock their devices all, due usability issues, use weak easy guess 4-digit PINs. This makes current approach protecting data-at-rest ineffective against guessing attackers. address problem we design, implement evaluate Sidekick system — that wearable device decouple locking. Evaluation revealed proposal can run on an 8-bit System-on-Chip, only 4 Kb/20 Kb RAM/ROM, allows key fetching in less than two seconds, while lasting for more year single coin-cell battery.