Cryptographie indéchiffrable

Cryptographie indéchiffrable (subtitle: basée sur de nouvelles combinaisons rationelles) is a French book on cryptography written by Émile Victor Théodore Myszkowski (a retired French colonel) and published in 1902.

Cryptographie indéchiffrable
AuthorÉmile Victor Théodore Myszkowski
LanguageFrench
GenreFactual
Publication date
1902

His book described a cipher that the author had invented and claimed (incorrectly) was "undecipherable" (i.e. secure against unauthorised attempts to read it). It was based on a form of repeated-key transposition.

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