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Product cipher
In
cryptography
, a
product cipher
combines two or more transformations in a manner intending that the resulting cipher is more secure than the individual components to make it resistant to
cryptanalysis
. The product cipher combines a sequence of simple transformations such as
substitution
,
permutation
, and
modular arithmetic
. The concept of product ciphers is due to
Claude Shannon
, who presented the idea in his foundational paper,
Communication Theory of Secrecy Systems
.
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