Visible to the public PCASA: Proximity Based Continuous and Secure Authentication of Personal Devices

TitlePCASA: Proximity Based Continuous and Secure Authentication of Personal Devices
Publication TypeConference Paper
Year of Publication2017
AuthorsHu, P., Pathak, P. H., Shen, Y., Jin, H., Mohapatra, P.
Conference Name2017 14th Annual IEEE International Conference on Sensing, Communication, and Networking (SECON)
Keywordsacoustic communication, Acoustic communication (telecommunication), Acoustic Fingerprints, authentication, authorisation, composability, differential pulse position modulation, Estimation, estimation theory, fingerprint scan, Human Behavior, message authentication, modulation, password, PCASA, Portable computers, Protocols, proximity based continuous and secure authentication, pubcrawl, pulse modulation, Resiliency, secure proximity estimation, user personal portable devices, wearable computers
AbstractUser's personal portable devices such as smartphone, tablet and laptop require continuous authentication of the user to prevent against illegitimate access to the device and personal data. Current authentication techniques require users to enter password or scan fingerprint, making frequent access to the devices inconvenient. In this work, we propose to exploit user's on-body wearable devices to detect their proximity from her portable devices, and use the proximity for continuous authentication of the portable devices. We present PCASA which utilizes acoustic communication for secure proximity estimation with sub-meter level accuracy. PCASA uses Differential Pulse Position Modulation scheme that modulates data through varying the silence period between acoustic pulses to ensure energy efficiency even when authentication operation is being performed once every second. It yields an secure and accurate distance estimation even when user is mobile by utilizing Doppler effect for mobility speed estimation. We evaluate PCASA using smartphone and smartwatches, and show that it supports up to 34 hours of continuous authentication with a fully charged battery.
Citation Keyhu_pcasa:_2017