A preliminary survey of systems like Episurveyor by Data-
Dyne [2] and ComCareHQ by DiMagi [1] (both based on
JavaRosa [15]), Nokia Data Gathering [14] and Mobenzi
Researcher [12], [24], revealed that the security issues we
found in openXdata were not an isolated case. We were not
able to collect any information on Voxiva [27], although they
claim to provide a secure solution.