Quantify of Delastelle
The figure of Delastelle - name of its inventor, the French Felix-Marie Delastelle (1840 - 1902), which had described of it for the first time the principle in the Revue Civil engineering in 1895, under the name of “new cryptography” - uses a grid of coding/deciphering similar to that of the Carré of Polybe. It locates the coordinates of several clear letters, mixes these coordinates, then reads in the grid the quantified letters corresponding to the new coordinates obtained. This process is known as tomogrammic. The elementary Treated of cryptography of Delastelle , only important civil cryptographe of the time, was published at Gauthier-Villars in 1902.
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