I have few question on security of Google Cloud Messaging Service (GCM)
- Is it possible to spoof messages that GCM server sends to android clients?
- Does server pushes data in encrypted format?
- Data that is pushed to android client by GCM server has any link with google account merged with android device?
- What actually the raw data pushed by GCM server consists of like ( registration id, push data .. etc) and more??