🚀 go-pugleaf

>>Anyways, one-time pads are really effective in short
>>messages and are reasonably secure on larger documents.

Arguably this is backwards. As suggested in "Codebreakers",
if I suspect that a "yes" or "no" decision is forthcoming, and I 
intercept a 3 character long message, I can make a reasonable
guess as to the message's contents.

More generally, "traffic analysis" is still a threat.  So some systems
send continuously, just sending nulls or-ed with the pad
(== the pad itself) when there is no real traffic.