Identifying Covert Channels
Ordinary things, such as existence of a file or time used for a computation, have been the medium through which a covert channel communicates. Covert channels are not easy to find because these media are so numerous and frequently used.
Two relatively old techniques remain the standards for locating potential covert channels. One works by analyzing the resources of a system and other works at the source-code level.
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Famous quotes containing the words identifying, covert and/or channels:
“And the serial continues:
Pain, expiation, delight, more pain,
A frieze that lengthens continually, in the lucky way
Friezes do, and no plot is produced,
Nothing you could hang an identifying question on.”
—John Ashbery (b. 1927)
“There was the murdered corpse, in covert laid,
And violent death in thousand shapes displayed;
The city to the soldier’s rage resigned;
Successless wars, and poverty behind;
Ships burnt in fight, or forced on rocky shores,
And the rash hunter strangled by the boars;
The newborn babe by nurses overlaid;
And the cook caught within the raging fire he made.”
—Geoffrey Chaucer (1340?–1400)
“As every pool reflects the image of the sun, so every thought and thing restores us an image and creature of the supreme Good. The universe is perforated by a million channels for his activity. All things mount and mount.”
—Ralph Waldo Emerson (1803–1882)