Cryptographie indéchiffrable
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Template:More citations needed Template:Infobox book Cryptographie indéchiffrable (English: Indecipherable Cryptography) (subtitle: basée sur de nouvelles combinaisons rationelles (based on new rational combinations)) is a French book on cryptography written by Émile Victor Théodore Myszkowski, a retired French Army colonel, and published in 1902.<ref>Template:Cite book</ref>
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.