• Félix Delastelle
    Félix-Marie Delastelle (2 January 1840 – 2 April 1902) was a French cryptographer, best known for inventing the bifid cipher, first presented in the Revue...
    2 KB (303 words) - 07:27, 1 April 2024
  • Trifid cipher
    is a classical cipher invented by Félix Delastelle and described in 1902. Extending the principles of Delastelle's earlier bifid cipher, it combines the...
    5 KB (669 words) - 19:08, 22 February 2024
  • Bifid cipher
    fractionation to achieve diffusion. It was invented around 1901 by Felix Delastelle. First, a mixed alphabet Polybius square is drawn up, where the I and...
    2 KB (379 words) - 20:14, 29 December 2023
  • Four-square cipher
    encryption technique. It was invented by the French cryptographer Felix Delastelle. The technique encrypts pairs of letters (digraphs), and thus falls...
    8 KB (1,528 words) - 04:51, 29 June 2024
  • Two-square cipher
    generally requires a much larger ciphertext in order to be useful. Félix Delastelle described the cipher in his 1901 book Traité élémentaire de cryptographie...
    11 KB (1,673 words) - 19:08, 29 June 2024
  • List of amateur mathematicians
    Crabtree (merchant) Nathan Daboll (cooper) Henri Delannoy (army officer) Felix Delastelle (bonded warehouseman) Martin Demaine (goldsmith and glass artist) Humphry...
    6 KB (518 words) - 09:33, 15 May 2024
  • Substitution cipher
    II. Several other practical polygraphics were introduced in 1901 by Felix Delastelle, including the bifid and four-square ciphers (both digraphic) and the...
    29 KB (3,985 words) - 17:28, 8 June 2024
  • Index of cryptography articles
    FEAL • Feige–Fiat–Shamir identification scheme • Feistel cipher • Félix Delastelle • Fialka • Filesystem-level encryption • FileVault • Fill device •...
    67 KB (2,933 words) - 23:58, 6 June 2024