John Abreau wrote:
On the other hand, if the individual routinely encrypts *everything*, and
if the metadata does not clearly identify which messages are of interest,
then it becomes much harder.

You have a routine. You suddenly start encrypting everything. If I compare your pre-everything routine to your post-everything routine then I can pick the high-value messages pretty easily. I might get a little bit of "chaff" but that's a relatively small cost. You would need to change your routine, effectively becoming a different target entirely, in order to force me to restart my analysis from scratch.

--
Rich P.
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