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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.
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.
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.
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.
Learn how letter frequency is the number of times letters of the alphabet appear on average in written language. See the most common letters in English and other languages, and how they are used in cryptography, keyboard layouts, and word puzzles.
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.
The Cryptogram is a play by American playwright David Mamet. The play concerns the moment when childhood is lost. The story is set in 1959 on the night before a young boy is to go on a camping trip with his father. The play premiered in 1994 in London, and has since been produced Off-Broadway in 1995 and again in London in 2006.