iMessage is encrypted end-to-end during the conversation but when you back up to iCloud it is no longer encrypted end-to-end. It is encrypted but Apple or a Warrant can review everything in your iMessage Account. This happens if either person backs up using iCloud. 

End-to-End encryption is the very best kind and it can not be hacked into in what is called Man-in-Middle, in other words only the two people one on each end can read the conversation. 



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