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  2. Hill cipher - Wikipedia

    en.wikipedia.org/wiki/Hill_cipher

    Hill's cipher machine, from figure 4 of the patent. In classical cryptography, the Hill cipher is a polygraphic substitution cipher based on linear algebra.Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was practical (though barely) to operate on more than three symbols at once.

  3. Polygraphic substitution - Wikipedia

    en.wikipedia.org/wiki/Polygraphic_substitution

    This was followed up over the next fifty years with the closely related four-square and two-square ciphers, which are slightly more cumbersome but offer slightly better security. [1] In 1929, Lester S. Hill developed the Hill cipher, which uses matrix algebra to encrypt blocks of any desired length. However, encryption is very difficult to ...

  4. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    The Hill cipher, invented in 1929 by Lester S. Hill, is a polygraphic substitution which can combine much larger groups of letters simultaneously using linear algebra. Each letter is treated as a digit in base 26 : A = 0, B =1, and so on.

  5. Lester S. Hill - Wikipedia

    en.wikipedia.org/wiki/Lester_S._Hill

    Lester S. Hill (1891–1961) was an American mathematician and educator who was interested in applications of mathematics to communications.He received a bachelor's degree (1911) and a master's degree (1913) from Columbia College and a Ph.D. from Yale University (1926).

  6. Playfair cipher - Wikipedia

    en.wikipedia.org/wiki/Playfair_cipher

    Playfair is no longer used by military forces because of known insecurities and of the advent of automated encryption devices. This cipher is regarded as insecure since before World War I. The first published solution of the Playfair cipher was described in a 19-page pamphlet by Lieutenant Joseph O. Mauborgne, published in 1914. [11]

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  8. Unicity distance - Wikipedia

    en.wikipedia.org/wiki/Unicity_distance

    In cryptography, unicity distance is the length of an original ciphertext needed to break the cipher by reducing the number of possible spurious keys to zero in a brute force attack. That is, after trying every possible key , there should be just one decipherment that makes sense, i.e. expected amount of ciphertext needed to determine the key ...

  9. Matrix (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Matrix_(mathematics)

    Matrix theory is the branch of mathematics that focuses on the study of matrices. ... Early encryption techniques such as the Hill cipher also used matrices. However, ...