Moskowitz, I.S., and M. H. Kang,  "Discussion of a Statistical Channel",
in Proc. IEEE Information Theory and Statistics Workshop, Alexandria, VA,
1994, p. 95.

<blockquote>
This paper deals with a new type of covert channel problem that arose
when we designed a multilevel secure computer (MLS) system, using a
quasi-secure, asynchronous, communication device called the Pump.  We
call this new type of covert channel a statistical channel.  It is our
hope to get feedback from experts who work in the intersection of
information theory and statistics.
</blockquote>