security in gcm upstream messaging

[Divya Aggarwal]

Hi,

My question is:

when i am implementing gcm upstream messaging. If anyone know sender id from apk, then he/she can send wrong data or send data after modify. How can gcm server identify it internally???

[Sergey Mkhitaryan]

Hi Divya,

There is no way GCM can tell if the client has tampered with upstream message.

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