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  2. Frequency analysis - Wikipedia

    en.wikipedia.org/wiki/Frequency_analysis

    Eve could use frequency analysis to help solve the message along the following lines: counts of the letters in the cryptogram show that I is the most common single letter, [2] XL most common bigram, and XLI is the most common trigram. e is the most common letter in the English language, th is the most common bigram, and the is the

  3. Letter Boxed - Wikipedia

    en.wikipedia.org/wiki/Letter_Boxed

    Letter Boxed is an online word puzzle video game created by Sam Ezersky and published in 2019 (soft-launched in 2018) on The New York Times Games. [1] It was the third game published in the puzzles section on the New York Times website after the Crossword and Spelling Bee . [ 2 ]

  4. Ricky McCormick's encrypted notes - Wikipedia

    en.wikipedia.org/wiki/Ricky_McCormick's_encrypted...

    The partially decomposed body of Ricky McCormick was discovered in a field in St. Charles County, Missouri on June 30, 1999. Sheriffs found two garbled hand-written notes – apparently written in secret code – in the victim's pockets, and these were handed over to the FBI for further investigation.

  5. Cryptanalysis of the Enigma - Wikipedia

    en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma

    In April 1937 [33] Knox made his first decryption of an Enigma encryption using a technique that he called buttoning up to discover the rotor wirings [34] and another that he called rodding to solve messages. [35] This relied heavily on cribs and on a crossword-solver's expertise in Italian, as it yielded a limited number of spaced-out letters ...

  6. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    Many people solve such ciphers for recreation, as with cryptogram puzzles in the newspaper. According to the unicity distance of English, 27.6 letters of ciphertext are required to crack a mixed alphabet simple substitution. In practice, typically about 50 letters are needed, although some messages can be broken with fewer if unusual patterns ...

  7. ROT13 - Wikipedia

    en.wikipedia.org/wiki/ROT13

    ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome, used by Julius Caesar in the 1st century BC. [1] An early entry on the Timeline of cryptography.

  8. Trifid cipher - Wikipedia

    en.wikipedia.org/wiki/Trifid_cipher

    The trifid cipher is a classical cipher invented by Félix Delastelle and described in 1902. [1] Extending the principles of Delastelle's earlier bifid cipher, it combines the techniques of fractionation and transposition to achieve a certain amount of confusion and diffusion: each letter of the ciphertext depends on three letters of the plaintext and up to three letters of the key.

  9. VIC cipher - Wikipedia

    en.wikipedia.org/wiki/VIC_cipher

    The VIC cipher can be regarded as the evolutionary pinnacle of the Nihilist cipher family.. The VIC cipher has several important integrated components, including mod 10 chain addition, a lagged Fibonacci generator (a recursive formula used to generate a sequence of pseudorandom digits), a straddling checkerboard, and a disrupted double transposition.