The Special Fish Report

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Messages in depth

P + PSI' + X = Z

(3) K = P + Z

(4) PSI' + X = K

Solution of (3) may be done by a process called "anagramming

Solution of (4) is called "key breaking."

Recovery of key by anagramming messages in depth is well understood

Message 1 - - - - - - - -
Message 2 - - - - - - - -
Difference - - - - - - -

N 9

8 E

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