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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. Kryptos - Wikipedia

    en.wikipedia.org/wiki/Kryptos

    In an article published on January 29, 2020, by The New York Times, Sanborn gave another clue: at positions 26–34, ciphertext "QQPRNGKSS" is the word "NORTHEAST". [10] In August 2020, Sanborn revealed that the four letters in positions 22–25, ciphertext "FLRV", in the plaintext are "EAST".

  4. List of cryptocurrencies - Wikipedia

    en.wikipedia.org/wiki/List_of_cryptocurrencies

    BitConnect was described as an open source, all-in-one bitcoin and crypto community platform but was later discovered to be a Ponzi scheme. 2018 KodakCoin: Kodak and WENN Digital Ethash [84] KodakCoin is a "photographer-centric" blockchain cryptocurrency used for payments for licensing photographs. Petro: Venezuelan Government: onixCoin [85 ...

  5. Cryptogram - Wikipedia

    en.wikipedia.org/wiki/Cryptogram

    Occasionally, cryptogram puzzle makers will start the solver off with a few letters. A printed code key form (the alphabet with a blank under each letter to fill in the substituted letter) is usually not provided but can be drawn to use as a solving aid if needed. Skilled puzzle solvers should require neither a code key form nor starter clue ...

  6. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    The Caesar cipher is named for Julius Caesar, who used an alphabet where decrypting would shift three letters to the left. The Caesar cipher is named after Julius Caesar, who, according to Suetonius, used it with a shift of three (A becoming D when encrypting, and D becoming A when decrypting) to protect messages of military significance. [4]

  7. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing ...

  8. Playfair cipher - Wikipedia

    en.wikipedia.org/wiki/Playfair_cipher

    The two letters of the digram are considered opposite corners of a rectangle in the key table. To perform the substitution, apply the following 4 rules, in order, to each pair of letters in the plaintext: If both letters are the same (or only one letter is left), add an "X" after the first letter. Encrypt the new pair and continue.

  9. Code (cryptography) - Wikipedia

    en.wikipedia.org/wiki/Code_(cryptography)

    The word Arizona was not in the German codebook and had therefore to be split into phonetic syllables. Partially burnt pages from a World War II Soviet KGB two-part codebook. In cryptology, a code is a method used to encrypt a message that operates at the level of meaning; that is, words or phrases are converted into something else. A code ...