Software Identifies Redacted Text From Gov’t Docs.
As referenced in today’s New York Times article, Illuminating Blacked-Out Words, see the following paper: Advances in Cryptology – EUROCRYPT 2004: International Conference on the Theory and Applications of Cryptographic Techniques, Interlaken, Switzerland, May 2-6, 2004. Proceedings, Projective Coordinates Leak (abstract only).