Show that Trudy's known-plaintext attack, in which she knows the (ciphertext, plaintext) translation pairs for seven letters,

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Show that Trudy's known-plaintext attack, in which she knows the (ciphertext, plaintext) translation pairs for seven letters, reduces the number of possible substitutions to be checked in the example in Section 8.2.1 by approximately 109.
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Computer Networking A Top-Down Approach

ISBN: 978-0136079675

5th edition

Authors: James F. Kurose, Keith W. Ross

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