Out of curiosity, what are you trying to accomplish by securing them? Prevent them from being read in transit, or protect your users privacy. I can see how securing them would prevent their being read in transit, but not protect users privacy. If they are encrypted on your server and no one can read them, then this would be a great feature, but if the board owners can decrypt them, I do not see how privacy is protected as the messages would not be impervious to a subpoena.
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