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RE: The future of Steem. What's coming and what I want to make happen.
I would caution against any type of encrypted but permanently stored private communications, due to the potential of these communications getting cracked in the future.
Identifying which of them to apply the brute force attack to will be a really big problem. And most nodes will discard the traffic anyway, once it expires. Possibly even some kind of rekeying process could be added to make it so every message uses a new cipher. User sends out request for new key, receiver replies with new key, message is encrypted. It doesn't have to be that frequent, but it would make it hard to collect more than a small amount at a time from one brute forced key break.