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WikiPedia: Mật_mã_Tím http://cryptocellar.web.cern.ch/cryptocellar/PURPL... http://cryptocellar.org/pubs/PurpleRevealed.pdf http://www.wnyc.org/books/1622 https://books.google.com/books?id=4UgEAAAAMBAJ&pg=... https://books.google.com/books?id=pmEfBrcn3PYC&pg=... https://web.archive.org/web/20080125130535/http://... https://web.archive.org/web/20130404171310/http://... https://www.wnyc.org/books/1622/