The World`s 10 Most Famous Uncracked Codes

This is a list of the ten most famous ciphers and writing systems that are still unsolved.




1.Kryptos

Kryptos is a sculpture by American artist James Sanborn located on the grounds of the Central Intelligence Agency (CIA) in Langley, Virginia, in the United States. Since its dedication on November 3, 1990, there has been much speculation about the meaning of the encrypted messages it bears. It continues to provide a diversion for employees of the CIA and other cryptanalysts attempting to decrypt the messages. The ciphertext on one half of the main sculpture contains 869 characters in total, however Sanborn released information in April of 2006 stating that an intended letter on the main half of Kryptos was missing. This would bring the total number of characters to 870 on the main portion. The other half of the sculpture comprises a Vigenère encryption tableau, comprised of 869 characters, if spaces are counted.

2.Linear A

Linear A is one of two linear scripts used in ancient Crete (a third script is Cretan Hieroglyphs). They were discovered and named by Arthur Evans. Linear B was deciphered in 1952 by Michael Ventris and was used to write Mycenaean Greek. Linear A is far from being totally deciphered but it is partially understood and it may be read through Linear B values. Though the two scripts share many of the same symbols, using the syllables associated with Linear B in Linear A writings produces words that are unrelated to any known language.

3.The Phaistos Disk

The disc of Phaistos is the most important example of hieroglyphic inscription from Crete and was discovered in 1903 in a small room near the depositories of the “archive chamber”, in the north - east apartments of the palace, together with a Linear A tablet and pottery dated to the beginning of the Neo-palatial period (1700- 1600 B.C.). Both surfaces of this clay disc are covered with hieroglyphs arranged in a spiral zone, impressed on the clay when it was damp. The signs make up groups divided from each other by vertical lines, and each of these groups should represent a word. Forty five different types of signs have been distinguished, of which a few can be identified with the hieroglyphs in use in the Proto- palatial period.

4.Shugborough Hall Enscription

The Shepherd’s Monument at Shugborough Hall carries a relief (pictured above) that shows a woman watching three shepherds pointing to a tomb. On the tomb is depicted the Latin text “Et in arcadia ego” (”I am also in Arcadia” or “I am even in Arcadia”). The relief is based on a painting by the French artist Nicholas Poussin, known itself as Et in Arcadia ego, but the relief has a number of modifications — most noticeably that it is reversed horizontally. Another difference is a change in which letter of the tomb a shepherd is pointing at. In the painting the letter R in ARCADIA is being pointed to. The finger in the sculpture is broken, but was pointing to the N in IN. The sculpture also adds an extra sarcophagus to the scene, placed on top of the one with the Latin phrase. Below the image of the monument are the following letters:

D  O.U.O.S.V.A.V.V.  M

For adherents of the modern Grail-conspiracy legend, the inscription is alleged to hold a clue to the location of the Holy Grail.

5.Chinese Gold Bar Cipher

In 1933, seven gold bars were allegedly issued to a General Wang in Shanghai, China. These gold bars appear to represent metal certificates related to a bank deposit with a U.S. Bank. The gold bars themselves have pictures, Chinese writing, some form of script writing, and cryptograms in latin letters. Not surprisingly, there is a dispute concerning the validity of the claim for the deposit. It may help to resolve the dispute if someone can decipher the cryptograms on the bars. Nobody has yet put for the a theory as to their meaning. The Chinese writing has been translated, and discusses a transaction in excess of $300,000,000.

6.Beale Ciphers

In 1885, a small pamphlet was published in Virginia containing a story and three encrypted messages. According to the pamphlet, around 1820 a man named Beale buried two wagons-full of treasure at a secret location in Bedford County, Virginia. He then left a small locked box with a local innkeeper, and left town, never to be seen again. The pamphlet went on to state that the innkeeper, after having not heard from Beale for many years, opened the box and discovered encrypted messages. Never able to read them, he eventually passed them along to a young friend shortly before the innkeeper’s death in 1863. According to the pamphlet, the friend spent the next 20 years trying to decrypt the messages, solving only one which detailed the tons of gold, silver and jewels that were buried, along with a general location. The still unsolved messages supposedly give exact directions, and a list of who the treasure belongs to.

7.Voynich Manuscript

At least 400 years old, this is a 232-page illuminated manuscript entirely written in a secret script. It is filled with copious drawings of unidentified plants, herbal recipes of some sort, astrological diagrams, and many small human figures in strange plumbing-like contraptions. The script is unlike anything else in existence, but is written in a confident style, seemingly by someone who was very comfortable with it. In 2004 there were some compelling arguments which described a technique that would seemingly prove that the manuscript was a hoax, but to date, none of the described techniques have been able to replicate a single section of the Manuscript, so speculations continue.

8.The Dorabella Cipher

Probably Elgar’s most popular work is his ‘Enigma’ Variations which, apart from its undoubted musical merit, still tantalises the musical detectives with the hidden ’secrets’ which Elgar cleverly wove into the fabric of the score. But Elgar, who was fascinated by codes, ciphers, riddles and other forms of puzzles, has left us another mystery - the ‘Dorabella’ cipher (pictured above). One hundred and ten years ago - to be precise, on the 14 July 1897 - Elgar sent a letter to a young friend, Miss Dora Penny, the 22 year-old daughter of the Rev. Alfred Penny, Rector of St Peter’s, Wolverhampton. The unusual feature of the letter was that it was in a cipher which, a century later, still presents a challenge. There have been a couple of attempts at solving it but neither of these seem entirely satisfactory.

9.Chaocipher

John F. Byrne invented Chaocipher in 1918 and tried unsuccessfully for almost 40 years to interest the U.S. government in his cipher system. He offered a reward to anyone who could break his cipher but the reward was never claimed. In 1989, John Byrne, son of John F. Byrne, demonstrated Chaocipher to two Cryptologia editors to determine if it had any commercial value. After making some improvements and providing additional information they jointly issue a new challenge to would-be solvers. In his autobiography, Silent Years, John F. Byrne, a lifelong friend of James Joyce, devoted the last chapter to Chaocipher which he had invented in 1918. Byrne described his attempts starting in 1920 to interest the State, War, and Navy Departments in his indecipherable cipher and his frustration with the disinterest shown by William F. Friedman and other cryptanalytic experts after he had demonstrated his machine.

10.D’agapeyeff Cipher

75628 28591 62916 48164 91748 58464 74748 28483 81638 18174
74826 26475 83828 49175 74658 37575 75936 36565 81638 17585
75756 46282 92857 46382 75748 38165 81848 56485 64858 56382
72628 36281 81728 16463 75828 16483 63828 58163 63630 47481
91918 46385 84656 48565 62946 26285 91859 17491 72756 46575
71658 36264 74818 28462 82649 18193 65626 48484 91838 57491
81657 27483 83858 28364 62726 26562 83759 27263 82827 27283
82858 47582 81837 28462 82837 58164 75748 58162 92000

The D’Agapeyeff cipher is an as-yet unbroken cipher that appears in the first edition of Codes and Ciphers, an elementary book on cryptography published by the Russian-born English cartographer Alexander D’Agapeyeff in 1939. Offered as a “challenge cipher” at the end of the book, it was not included in later editions, and D’Agapeyeff is said to have admitted later to having forgotten how he had encrypted it. It has been argued that the failure of all attempts at decryption is due to D’Agapeyeff incorrectly encrypting the original text. However, it has been argued that the cipher may still be successfully attacked using computational methods such as genetic algorithms.

Sources: Wikipedia, IACR
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