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Learn about the origin, development and features of cryptic crosswords, a popular word puzzle in the UK and other countries. Find out how to solve fair clues that contain definition, anagram indicator and fodder, and how to distinguish between basic and themed cryptics.
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 cryptogram is a puzzle that consists of a short piece of encrypted text, usually using a simple cipher that can be solved by hand. Learn about the origin, types and methods of cryptograms, and see some famous examples and challenges.
The Zebra Puzzle is a well-known logic puzzle.Many versions of the puzzle exist, including a version published in Life International magazine on December 17, 1962. The March 25, 1963, issue of Life contained the solution and the names of several hundred successful solvers from around the world.
These two values are chosen in this way to ensure that the resulting shared secret can take on any value from 1 to p–1. Here is an example of the protocol, with non-secret values in blue, and secret values in red. Alice and Bob publicly agree to use a modulus p = 23 and base g = 5 (which is a primitive root modulo 23).
A book cipher is a cipher in which each letter or word of the plaintext is replaced by a code that locates it in another text, the key. Learn about the history, security, and examples of book ciphers, such as the Beale ciphers and the Cicada 3301 mystery.
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