''Cryptographie indéchiffrable'' (subtitle: ''basée sur de nouvelles combinaisons rationelles'') is a French book on
cryptography
Cryptography, or cryptology (from grc, , translit=kryptós "hidden, secret"; and ''graphein'', "to write", or ''-logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of adver ...
written by
Émile Victor Théodore Myszkowski (a retired French colonel) and published in 1902.
His book described a
cipher
In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure. An alternative, less common term is ''encipherment''. To encipher or encode i ...
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.
References
See also
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Books on cryptography
Books on cryptography have been published sporadically and with highly variable quality for a long time. This is despite the tempting, though superficial, paradox that secrecy is of the essence in sending confidential messages — see Kerckhoffs ...
*
Transposition cipher
Cryptography books
1902 non-fiction books
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