X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=bifid.py;fp=bifid.py;h=683297b13b459d50b3cd7f8e6268e890bb5e819f;hb=3d8f7067b9c3a48ef140d7cff834d18ee91f58b3;hp=0000000000000000000000000000000000000000;hpb=21c390a77d42729afa23844ef2f1295106bed3de;p=cipher-tools.git

diff --git a/bifid.py b/bifid.py
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+++ b/bifid.py
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+import multiprocessing 
+from utilities import *
+from language_models import *
+from keyword_cipher import KeywordWrapAlphabet
+
+from logger import logger
+
+def bifid_grid(keyword, wrap_alphabet, letter_mapping):
+    """Create the grids for a Bifid cipher
+    """
+    cipher_alphabet = keyword_cipher_alphabet_of(keyword, wrap_alphabet)
+    if letter_mapping is None:
+        letter_mapping = {'j': 'i'}
+    translation = ''.maketrans(letter_mapping)
+    cipher_alphabet = cat(collections.OrderedDict.fromkeys(cipher_alphabet.translate(translation)))
+    f_grid = {k: ((i // 5) + 1, (i % 5) + 1) 
+              for i, k in enumerate(cipher_alphabet)}
+    r_grid = {((i // 5) + 1, (i % 5) + 1): k 
+              for i, k in enumerate(cipher_alphabet)}
+    return translation, f_grid, r_grid
+
+def bifid_encipher(message, keyword, wrap_alphabet=KeywordWrapAlphabet.from_a, 
+                   letter_mapping=None, period=None, fillvalue=None):
+    """Bifid cipher
+
+    >>> bifid_encipher("indiajelly", 'iguana')
+    'ibidonhprm'
+    >>> bifid_encipher("indiacurry", 'iguana', period=4)
+    'ibnhgaqltm'
+    >>> bifid_encipher("indiacurry", 'iguana', period=4, fillvalue='x')
+    'ibnhgaqltzml'
+    """
+    translation, f_grid, r_grid = bifid_grid(keyword, wrap_alphabet, letter_mapping)
+    
+    t_message = message.translate(translation)
+    pairs0 = [f_grid[l] for l in sanitise(t_message)]
+    if period:
+        chunked_pairs = [pairs0[i:i+period] for i in range(0, len(pairs0), period)]
+        if len(chunked_pairs[-1]) < period and fillvalue:
+            chunked_pairs[-1] += [f_grid[fillvalue]] * (period - len(chunked_pairs[-1]))
+    else:
+        chunked_pairs = [pairs0]
+    
+    pairs1 = []
+    for c in chunked_pairs:
+        items = sum(list(list(i) for i in zip(*c)), [])
+        p = [(items[i], items[i+1]) for i in range(0, len(items), 2)]
+        pairs1 += p
+    
+    return cat(r_grid[p] for p in pairs1)
+
+
+def bifid_decipher(message, keyword, wrap_alphabet=KeywordWrapAlphabet.from_a, 
+                   letter_mapping=None, period=None, fillvalue=None):
+    """Decipher with bifid cipher
+
+    >>> bifid_decipher('ibidonhprm', 'iguana')
+    'indiaielly'
+    >>> bifid_decipher("ibnhgaqltm", 'iguana', period=4)
+    'indiacurry'
+    >>> bifid_decipher("ibnhgaqltzml", 'iguana', period=4)
+    'indiacurryxx'
+    """
+    translation, f_grid, r_grid = bifid_grid(keyword, wrap_alphabet, letter_mapping)
+    
+    t_message = message.translate(translation)
+    pairs0 = [f_grid[l] for l in sanitise(t_message)]
+    if period:
+        chunked_pairs = [pairs0[i:i+period] for i in range(0, len(pairs0), period)]
+        if len(chunked_pairs[-1]) < period and fillvalue:
+            chunked_pairs[-1] += [f_grid[fillvalue]] * (period - len(chunked_pairs[-1]))
+    else:
+        chunked_pairs = [pairs0]
+        
+    pairs1 = []
+    for c in chunked_pairs:
+        items = [j for i in c for j in i]
+        gap = len(c)
+        p = [(items[i], items[i+gap]) for i in range(gap)]
+        pairs1 += p
+
+    return cat(r_grid[p] for p in pairs1) 
+
+
+
+
+def bifid_break_mp(message, wordlist=keywords, fitness=Pletters, max_period=10,
+                     number_of_solutions=1, chunksize=500):
+    """Breaks a keyword substitution cipher using a dictionary and
+    frequency analysis
+
+    >>> bifid_break_mp(bifid_encipher('this is a test message for the ' \
+          'keyword decipherment', 'elephant', wrap_alphabet=KeywordWrapAlphabet.from_last), \
+          wordlist=['cat', 'elephant', 'kangaroo']) # doctest: +ELLIPSIS
+    (('elephant', <KeywordWrapAlphabet.from_last: 2>, 0), -52.834575011...)
+    >>> bifid_break_mp(bifid_encipher('this is a test message for the ' \
+          'keyword decipherment', 'elephant', wrap_alphabet=KeywordWrapAlphabet.from_last), \
+          wordlist=['cat', 'elephant', 'kangaroo'], \
+          number_of_solutions=2) # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE
+    [(('elephant', <KeywordWrapAlphabet.from_last: 2>, 0), -52.834575011...), 
+    (('elephant', <KeywordWrapAlphabet.from_largest: 3>, 0), -52.834575011...)]
+    """
+    with multiprocessing.Pool() as pool:
+        helper_args = [(message, word, wrap, period, fitness)
+                       for word in wordlist
+                       for wrap in KeywordWrapAlphabet
+                       for period in range(max_period+1)]
+        # Gotcha: the helper function here needs to be defined at the top level
+        #   (limitation of Pool.starmap)
+        breaks = pool.starmap(bifid_break_worker, helper_args, chunksize)
+        if number_of_solutions == 1:
+            return max(breaks, key=lambda k: k[1])
+        else:
+            return sorted(breaks, key=lambda k: k[1], reverse=True)[:number_of_solutions]
+
+def bifid_break_worker(message, keyword, wrap_alphabet, period, fitness):
+    plaintext = bifid_decipher(message, keyword, wrap_alphabet, period=period)
+    fit = fitness(plaintext)
+    logger.debug('Keyword break attempt using key {0} (wrap={1}) gives fit of '
+                 '{2} and decrypt starting: {3}'.format(keyword, 
+                     wrap_alphabet, fit, sanitise(plaintext)[:50]))
+    return (keyword, wrap_alphabet, period), fit
+
+if __name__ == "__main__":
+    import doctest
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