Category
page 1Undeciphered historical codes and ciphers
Voynich manuscript
illustrated codex hand-written in an unknown writing system

Zodiac Killer
serial killer in California
Sator Square
word square containing a five-word Latin palindrome
Kryptos
Kryptos is a sculpture by the American artist Jim Sanborn located on the grounds of the Central Intelligence Agency (CIA) headquarters, the George Bush Center for Intelligence in Langley, Virginia.
Somerton Man
1948 unsolved death of an unidentified man in Somerton, South Australia
Olivier Levasseur
French pirate
Beale ciphers
a set of three ciphertexts
Dorabella Cipher
Enciphered letter written by English composer Edward Elgar
James Hampton
American outsider artist (1909–1964)
Santa Maria La Nova
church buiilding in Naples, Italy
YOGTZE case
a death in Germany in 1984, which was considered a supposedly unsolved criminal case until 2025
Shugborough inscription
Sequence of letters – O U O S V A V V, between the letters D M – carved on the 18th-century Shepherd's Monument in the grounds of Shugborough Hall in Staffordshire, England
D'Agapeyeff cipher
unbroken cipher
Ricky McCormick's encrypted notes
Unsolved encrypted message associated with unsolved homicide
list of ciphertexts
Wikimedia list article

Henry Debosnys
U.S. American murder