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I bet it's gibberish, like the artist was giving the spooks something to work on besides world domination once in a while.

The artist has done other sculptures that have been solved, and the first 3 parts have been solved. So I doubt it is gibberish.

If you are interested you might check out Elonka's website: http://elonka.com/kryptos/

She's given talks all over the country on Kryptos.