Hacking Secret Ciphers with Python
Chapter 14 – Modular Arithmetic and the Multiplicative Cipher 201 Above are some rectangular blocks with a width of 1 unit, 2 un ...
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Figure 14 - 6. Cuisenaire rods de ...
Chapter 14 – Modular Arithmetic and the Multiplicative Cipher 203 Be sure to have the same number of variables as you have value ...
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Figure 14 - 7. Euclid may or may ...
Chapter 14 – Modular Arithmetic and the Multiplicative Cipher 205 “Relatively Prime” Relatively prime numbers are used for the m ...
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Table 14 - 1. Encrypting each let ...
Chapter 14 – Modular Arithmetic and the Multiplicative Cipher 207 Practice Exercises, Chapter 14, Set D Practice exercises can b ...
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So some keys will work in the aff ...
Chapter 14 – Modular Arithmetic and the Multiplicative Cipher 209 3 is not the modular inverse of 7 mod 26, because (7 * 3) % ...
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The // Integer Division Operator ...
Chapter 14 – Modular Arithmetic and the Multiplicative Cipher 211 u1, u2, u3 = 1, 0, a v1, v2, v3 = 0, 1, m while v3 != 0: q = ...
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The affine cipher is sort of like ...
Chapter 15 – The Affine Cipher 213 THE AFFINE CIPHER Topics Covered In This Chapter: The Affine Cipher Generating random key ...
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Source Code of the Affine Cipher ...
Chapter 15 – The Affine Cipher 215 if keyB == 0 and mode == 'encrypt': sys.exit('The affine cipher becomes incredibly weak when ...
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if cryptomath.gcd(keyA, len(SYMB ...
Chapter 15 – The Affine Cipher 217 The sys module is imported for the exit() function. The pyperclip module is imported for ...
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Splitting One Key into Two Keys a ...
Chapter 15 – The Affine Cipher 219 Input Validation on the Keys affineCipher.py def checkKeys(keyA, keyB, mode): if keyA == 1 a ...
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Finally, Key A must be relatively ...
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