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The Nature of Mathematics – 13th Edition

Decoding

Reference Topics 5-8

July 8, 2017July 8, 2015 by elaine

This site makes a transition from the modular arithmetic (of the last section) to writing secret codes (of this section). A Caesar cipher is a secret code in which each letter in the plain text is replaced by a letter … See the whole entry

Categories Chapter 05, Reference Topics Tags Caesar cipher, Cryptography, Decoding, Encoding

Homework Hints 5-8

October 22, 2015July 8, 2015 by elaine

Note: Homework Hints are given only for the Level 1 and Level 2 problems.

However, as you go through the book be sure you look at all the examples in the text. If you need hints for the Level 3 … See the whole entry

Categories Chapter 05, Homework Hints Tags Decoding, Encoding, Simple codes

Section 5.8: Cryptography

September 24, 2015July 8, 2015 by elaine

5.8 Outline

  1. Definition
  2. Simple codes
  3. Modular codes
    1. definition
    2. encrypt
    3. encoding key
    4. ciphertext
    5. decoding key
  4. Unbreakable codes

 

5.8 Essential Ideas

Cryptography is the art of writing or deciphering messages in code. This is an applied section which uses essential ideas … See the whole entry

Categories Chapter 05, Essential Ideas Tags Ciphertext, Cryptography, Decoding, Encoding, Modular codes, Simple codes
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