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SoK: Systematic Classification of Side-Channel Attacks on Mobile Devices

Side-channel attacks on mobile devices have gained increasing attention since their introduction in 2007. While traditional side-channel attacks, such as power analysis attacks and electromagnetic analysis attacks, required physical presence of the attacker as well as expensive equipment, an (unprivileged) application is all it takes to exploit the leaking information on modern mobile devices. Given the vast amount of sensitive information that are stored on smartphones, the ramifications of side-channel attacks affect both the security and privacy of users and their devices. 
In this paper, we propose a new categorization system for side-channel attacks on mobile devices, which is necessary since side-channel attacks have evolved significantly since their introduction during the smartcard era. Our proposed classification system allows to analyze side-channel attacks systematically, and facilitates the development of novel countermeasures. Besides this new categorization system, the extensive overview of existing attacks and attack strategies provides valuable insights on the evolving field of side-channel attacks on mobile devices. We conclude by discussing open issues and challenges in this context and outline possible future research directions.