It's very hard, cos you can't own a river and accord a fisherman an absolute control over the river, you'd always want to inspect how he surfs your sea, that's a pure picture of the impossibility of end to end encryption and this is inevitable as an unsupervised use of communication gadgets is a huge threat to the general security, if iPhones weren't encrypted, maybe the San Bernardino attack would have been averted if the servers got the Intel on time.
Awesome post over there.
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