USER VERIFICATION FROM WALKING ACTIVITY - First Steps towards a Personal Verification System Topics: Context-Aware Applications; Human and Computer Interaction; Mobile Computing; Security and Privacy; Ubiquitous Computing Systems and Services In Proceedings of the 1st International Conference on Pervasive and Embedded Computing and Communication Systems PECCS - Volume 1, 179-185, 2011 , Vilamoura, Algarve, Portugal