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Famous Unsolved Coded Messages

Name: Famous Unsolved Coded Messages
Creator: Community curated
License: https://creativecommons.org/licenses/by/4.0/

The Zodiac cipher, Voynich manuscript, Kryptos — which uncracked code is the most tantalizing mystery?

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Source:Community curated

Updated:3/7/2026

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Coded Message↕	Year Created↕	Origin↕	Status↕	Known For↕
Zodiac Killer's Z340 Cipher	1969	San Francisco, USA	Solved 2020 (51 years later)	Serial killer's taunting cipher sent to newspapers, cracked by amateur codebreakers in 2020, Z408 solved earlier
Voynich Manuscript	c. 1404-1438	Unknown (possibly Italy)	Unsolved	220-page illustrated codex in unknown script and language, bizarre botanical drawings, defies all decryption attempts
Kryptos (CIA Sculpture)	1990	CIA Headquarters, Langley, VA	3 of 4 sections solved, K4 unsolved	Jim Sanborn's sculpture at CIA HQ, final 97 characters still unsolved, even the CIA can't crack it
Beale Ciphers	c. 1820s	Bedford County, Virginia	1 of 3 solved, treasure unfound	Allegedly describes location of buried gold/silver treasure worth $43M+, cipher #2 keyed to Declaration of Independence
Dorabella Cipher	1897	England	Unsolved	87 characters written by composer Edward Elgar to a friend, nobody knows the alphabet or the message
Shugborough Inscription	c. 1748-1763	Shugborough Hall, England	Unsolved	8 letters O-U-O-S-V-A-V-V carved beneath relief of Poussin painting, possibly Holy Grail clue, Bletchley Park failed
Phaistos Disc	c. 1700 BCE	Crete, Minoan civilization	Unsolved	Fired clay disc with 241 stamped symbols in spiral, one-of-a-kind artifact, Bronze Age mystery
Tamam Shud Case (Somerton Man)	1948	Adelaide, Australia	Code unsolved, body identified 2022	Dead man on beach with torn page from Omar Khayyam, coded letters on back, identity was finally solved via DNA in 2022
Chaocipher	1918	USA	Algorithm revealed 2010 posthumously	John Byrne's cipher machine offered to US government, rejected, kept secret for 90 years, family donated papers
Ricky McCormick's Encrypted Notes	1999	St. Louis, Missouri	Unsolved	Two coded notes found in murdered man's pockets, FBI's top unsolved cryptanalysis case, may be key to homicide
D'Agapeyeff Cipher	1939	England	Unsolved (author forgot key)	Published as a challenge in a cryptography textbook, the author later admitted he couldn't remember how he encrypted it
Rohonc Codex	Unknown (pre-1743)	Possibly Hungary	Unsolved	192-page codex in unknown writing system with religious illustrations, dismissed as hoax by some, 10 times Voynich's size
Copiale Cipher	c. 1730s	Germany	Solved 2011	105-page manuscript of a secret society's initiation rituals, cracked using computational linguistics, revealed oculist lodge
Linear A	c. 1800-1450 BCE	Minoan Crete	Unsolved	Script of the Minoan civilization, predecessor to Linear B (which was deciphered), language itself is unknown
Zodiac Killer's Z13 and Z32	1969-1970	San Francisco, USA	Unsolved	Short ciphers claiming to contain the Zodiac's real name, too short to crack statistically, taunting 'My name is...'