Taken from the slightly longer Wikipedia page at [1]

In cryptography, ciphertext (or cyphertext) is the result of encryption performed on plaintext using an algorithm, called a cipher.

Some famous ciphertexts (or cryptograms) are:

  • The Babington Plot ciphers
  • Beale ciphers
  • The Book of the Law
  • Copiale cipher
  • Chaocipher
  • The cryptogram in "The Gold-Bug"
  • Cryptogram of Olivier Levasseur
  • D'Agapeyeff cipher
  • Dorabella Cipher
  • Kryptos
  • The Magic Words are Squeamish Ossifrage
  • Markovian Parallax Denigrate
  • Ricky McCormick's encrypted notes
  • The use of the Purple Machine by Japan before the Pearl Harbor Attack
  • Rohonc Codex
  • The Shugborough inscription
  • Quipu
  • Tamam Shud case
  • Smithy code, embedded within the 2006 judgement on The Da Vinci Code case
  • Voynich Manuscript
  • The Zimmermann Telegram
  • Zodiac Killer ciphers

For more details see the relevant articles on Wikipedia and the other Voynich Wiki [2] and see also * Elonka Dunin's List of Famous Unsolved Codes and Ciphers