ePet: When Cellular Phone Learns to Recognize Its Owner

Document Type

Conference Proceeding



Format of Original

6 p.

Publication Date



Association for Computing Machinery

Source Publication

Proceedings of the 2nd ACM Workshop on Assurable and Usable Security Configuration

Source ISSN


Original Item ID

doi: 10.1145/1655062.1655066


In this paper an adaptive solution to secure the authentication process of cellular phones has been proposed. Gait and location tracks of the owner are used as the metrics for authentication. The cellular phone is envisioned to become as adaptive as a pet animal of the owner. The cellular phone learns various intrinsic attributes of the owner like his voice, face, hand and fingerprint geometry and interesting patterns in the owner's daily life and remembers those to continually check against any anomalous behavior that may occur due to the stealing of the phone. The checking is done level wise. Higher level of authentication is more stringent. Only when the cellular phone recognizes significant anomaly in a lower level, it goes one level up in the security hierarchy. The iPhone's accelerometer and A-GPS module have been utilized to record gait and location signatures. A fast and memory efficient variation of Dynamic Time Warping (DTW) algorithm called FastDTW has been used to compute the similarity score between gait samples.


Published as part of the proceedings of the conference, the 2nd ACM Workshop on Assurable and Usable Security Configuration, 2009: 13-18. DOI.