Tài liệu tham khảo

WikiPedia: Kryptos http://articles.baltimoresun.com/2000-03-17/news/0... http://www.cnn.com/2005/US/06/19/cracking.the.code... http://www.ctmuseumquest.com/?page_id=5425 http://elonka.com/kryptos/faq.html http://elonka.com/kryptos/sanborn/IndianRunPark.ht... http://www.elonka.com/kryptos http://www.elonka.com/kryptos/CorrectedK2Announcem... http://www.elonka.com/kryptos/faq.html http://www.elonka.com/kryptos/mirrors/cypherpunks/... http://www.elonka.com/kryptos/transcript.html