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From the Schneier on Security blog

Jim Sanborn, who designed the Kryptos sculpture in a CIA courtyard, has released another clue to the still-unsolved part 4. I think he’s getting tired of waiting. Did we mention Mr. Sanborn is 74? Holding on to one of the world’s most enticing secrets can be stressful. Some would-be codebreakers have appeared at his home. Many felt they had solved…