Applications 716 and 718 shown in connection with interface engine 702 are applications developed by third-parties. In some examples, such applications include any suitable application that benefits from accessing data. For example, the application 716 may be a health application, a nutrition application, a fitness application, and other similar applications. The interaction system may include data pertaining to hundreds of thousands of entities. Having data pertaining to so many entities presents security concerns. For example, much of the data may be identifying data. Accordingly, data that may be accessed by applications 716 and 718 may be limited. In some examples, an entity of the interaction system may use one of applications 716, 718 to access his or her own data. In this example, the identity of the entity may be verified in accordance with techniques described herein.
User devices 706-714 are any suitable user devices capable of running applications 716-724. User devices 706-714 are examples of the user device 228. In some examples, the user devices include: mobile phones, tablet computers, laptop computers, wearable mobile devices, desktop computers, set-top boxes, pagers, and other similar user devices. In some examples, at least some of user devices 706-714 are the same devices as at least some of the one or more components 410-418. In some examples, user devices 706-714 may include complementary layers to application/device layer 320 and/or receiving layer 302. For example, user devices 706-714 may include a transmission layer, a generation layer, and/or a receiving layer to communicate data at application/device layer 320 and at receiving layer 302.