Quote: a good secrecy system: two substitutions before and after a mixing function; diffuses and confuses redundancy in the message

Quotation Skeleton

Speaking loosely, … we can think of a mixing transformation as … … One which looks fairly good [for natural language] is to … [p. 713] Suppose that F is a good mixing … two simple families of transformations … For concreteness we may think of them as … … the redundancy has been both diffused and confused … all parts of the key (when the mix … T is omitted the remaining system is similar … and then solves. … By supplying two sets of unknowns, the key … have "entangled" the unknowns together in a way …   Google-1   Google-2

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Quote: a good mixing function for natural language: a transposition followed by a sequence of alternating substitutions and linear operations

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