In one embodiment, a user device may store state data for an application at an internet-accessible data storage 124 for access by other devices of the user. The target user device 140 may use an untrusted platform 142 to generate an access request 300 for an application state data set for a source application 114. The target user device 140 may send the access request 300 to the internet-accessible data storage 124. The target user device 140 may send an access credential 330 to the internet-accessible data storage 124.