Hacking Secret Ciphers with Python
Chapter 20 – Frequency Analysis 301 Figure 20-2. Letter frequency of normal English, sorted. The word “ETAOIN” is a handy way to ...
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the letter frequency of each subk ...
Chapter 20 – Frequency Analysis 303 Figure 20-3. How the frequency match score of ASRXJILPWMCYOUEQNTHBFZGKVD is calculated. The ...
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The above ciphertext was encrypte ...
Chapter 20 – Frequency Analysis 305 frequency taken from http://en.wikipedia.org/wiki/Letter_frequency englishLetterFreq = ...
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third, put each list of letters ...
Chapter 20 – Frequency Analysis 307 frequency taken from http://en.wikipedia.org/wiki/Letter_frequency englishLetterFreq ...
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The getLetterCount() function ret ...
Chapter 20 – Frequency Analysis 309 frequently occurring in the message parameter. first, get a dictionary of each letter ...
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to frequency values, the freqToLe ...
Chapter 20 – Frequency Analysis 311 Python’s sort() function can do this sorting for us if we pass it a function or method for i ...
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the function in foo to the variab ...
Chapter 20 – Frequency Analysis 313 someListVariable.sort() ...as being equivalent to this: def func(x): return x # sorting base ...
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[('mice', 3), ('cats', 10), ('dog ...
Chapter 20 – Frequency Analysis 315 Sorting the Items from a Dictionary freqAnalysis.py 51. # fourth, convert the freqToLetter d ...
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'A', 'N', 'O', 'R', 'S', 'H', 'C' ...
Chapter 20 – Frequency Analysis 317 freqAnalysis.py 78. # Find how many matches for the six least common letters there are. 79. ...
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HACKING THE VIGENÈRE CIPHER Topic ...
Chapter 21 – Hacking the Vigenère Cipher 319 There are two different methods to hack the Vigenère cipher. The first is a brute-f ...
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def hackVigenere(ciphertext) ...
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