Abstract —  
I. INTRODUCTION  
A. Motivation and Contributions  
B. Organization  
II. ZERO-INTERACTION BASED CO-PRESENCE DETECTION AND AUTHENTICATION  
A. Overview of ZICDA system  
B. Communication Technologies  
C. Communication and Adversary Models  
D. Attacks vector for ZICDA Systems  
III. CONTEXT-AWARE CO-PRESENCE DETECTION TECHNIQUES  
A. System Model for Context-based Access Control in ZICDA Systems  
IV. OPEN ISSUES AND DIRECTIONS FOR FUTURE WORK  
V. CONCLUSIONS