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A cryptogram is a puzzle that consists of a short piece of encrypted text, usually using a simple cipher. Learn about the origin, types and methods of solving cryptograms, and see some famous examples and challenges.
Cryptography is the practice and study of techniques for secure communication in the presence of adversarial behavior. Learn about the core concepts, terminology, and history of cryptography, as well as its modern applications in computer science, information security, and digital media.
A ciphertext or cryptogram is a message encrypted with a cipher. This page lists some famous ciphertexts from different periods of history, with their decipherment status and references.
The American Cryptogram Association (ACA) is an American non-profit organization devoted to the hobby of cryptography, with an emphasis on types of codes, ciphers, and cryptograms that can be solved either with pencil and paper, or with computers, but not computer-only systems.
Kryptos is a sculpture by Jim Sanborn at the CIA headquarters in Virginia, featuring four enigmatic messages in copper plates. The first three messages have been solved, while the fourth one remains unsolved and may reveal a fifth message.
A substitution cipher is a method of encrypting in which units of plaintext are replaced with ciphertext, using a key. Learn about different types of substitution ciphers, such as simple, mixed, and polyalphabetic, and their security and history.
A musical cryptogram is a sequence of musical symbols that refers to an extra-musical text by some logical relationship, usually between note names and letters. Learn about the history, systems and examples of musical cryptograms in Western music, from Josquin des Prez to Olivier Messiaen.
A short story by Edgar Allan Poe about a treasure hunt based on a cryptogram and a gold-colored bug. Learn about the plot, the cryptogram, the characters, and the historical context of this classic tale of ratiocination.