"I myself feel that our country, for whose Constitution I fought in a just war, might as well have been invaded by Martians and body snatchers."
There are several mentions of message cylinders in the Dune novels. The idea is that these metal cylinders are locked; the message tape itself typically corrodes quickly and becomes unreadable when exposed to air.
This does not seem to be one of the more highly developed technologies - many times, they are described has having been captured and read by the enemy.
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