13. Pigeon Cipher: There was an unsolved WWII message found attached to the remains of a pigeon which were found in a chimney.
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25. Bacon Cipher: Sir Francis Bacon created these ciphers in his literary works. There has been speculation that he was responsible for Shakespear's works, but there has been no conclusion made.
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24. Bellaso Ciphers: Bellaso, a 16th century Italian cryptologist, is responsible for many techniques used today and many of his challenge ciphers have yet to be solved.
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23. Blitz Ciphers: These were discovered during WWII in a bombed cellar in East London. They depict 50 calligraphic symbols possibly 18th century Freemason ciphers.
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22. Navajo Code Talkers: During WWII, the Allies used Navajo Indians in order to send encrypted messages. Because the language is so difficult normally, the code was never broken.
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21. Shugborough Inscription: These letters were carved into stone in Shugborough Hall in Staffordshire, England. No one knows why or what their meaning is.
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20. Chao cipher: Its not technically unsolved, but no one knows why is was in author J.F. Byrnes autobiography.
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19. McCormick Cipher: In 1999, the body of Ricky McCormick was found in a field in eastern Missouri. He had two ciphers in his pockets. The FBI has asked for the publics help, but so far no one has cracked it.
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18. Taman Shud: A body washed up on a beach in Australia along with scraps of paper. It was located near an abandoned car with a book inside. The numeric codes in that book were discovered but never solved.
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17. Rohonc Codex: Named after a city in western Hungary, it was written in an unknown language.
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16. Proto-Elamite: This script first appeared in 2,900 BC in south western Iran. It has yet to be deciphered.
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15. Vinca Old European: A collection of symbols were found on artifacts from between 6,000 to 4,500 BC. Its not known if these symbols are a writing system.
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14. Rongo Rongo Script of Easter Island: In 1868, Europeans found wooden tablets on Easter Island. They were covered in unknown hieroglyphics, and there has been little progress made in determining what they say.
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1. Beale Ciphers: In 1885, a small pamphlet was published in Virginia containing encrypted messages. They were supposed to lead to a treasure, but were never solved.
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12. Enigma Encryption System: This popular encryption mechanism used by Germany in WWII resulted in some messages that couldn't ever be deciphered.
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11. Richard Feynmans Challenge Ciphers: In 1987, a Caltech professor named Richard Feynman was given three samples of code by a colleague. Only one was ever solved.
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10. Indus Script: The Indus Valley civilization existed in 2600 to 1800 BC, and they left behind thousands of objects inscribed with pictograph scripts.
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9. Chinese Gold Bar Ciphers: In 1933, seven gold bars were issued to General Wang in Shanghai, containing pictures, writing, cryptograms and Latin letters.
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8. The Phaistos Disk: This circular clay tablet is about six inches across, discovered in the early 1900s. This alphabet could possibly help decipher Linear A.
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7. Linear A: In 1990, a large number of clay tablets dating back to 1800 BC were discovered in Crete. It contained two scripts Linear A and Linear B, but only Linear B was ever puzzled out.
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6. D'Agapeyeff Cipher: Alexander D'Agapeyeff wrote a book on cryptography in 1939 including this challenge cypher. Not even he could solve it.
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5. Dorabella Cipher: In 1897, composer Edward Elgar sent this encrypted message to a 23 year-old friend, Dora Penny. It hasn't been solved.
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4. Kryptos: In 1990, a sculpture with 4 sections of encryptions was installed at the CIA headquarters. The 4th section has not been solved.
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3. Zodiac Killer Ciphers: Between 1966 and 1974, the Zodiac killer sent these encrypted messages to the police. Many remain unsolved.
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2. Voynich Manuscript: This is allegedly 600 years old and completely handwritten in an undecipherable language, possibly a medical textbook.
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