X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=cipherbreak.py;h=f1ab58e50a4f293368ef9d5382aef9dabf590420;hb=8543ce0d45e4046c2c056e395ddf91d3c8a35586;hp=8a4d7b14942f2e9873eeb73b6ca270ba7ac21af7;hpb=f660b5cf85c55e418f2e9f8dc359304714821b33;p=cipher-tools.git diff --git a/cipherbreak.py b/cipherbreak.py index 8a4d7b1..f1ab58e 100644 --- a/cipherbreak.py +++ b/cipherbreak.py @@ -13,11 +13,22 @@ from multiprocessing import Pool import matplotlib.pyplot as plt -logger = logging.getLogger(__name__) -logger.addHandler(logging.FileHandler('cipher.log')) +# logging.basicConfig(filename="cipher.log", level=logging.INFO) +# logger = logging.getLogger(__name__) + +logger = logging.getLogger('cipherbreak') logger.setLevel(logging.WARNING) -#logger.setLevel(logging.INFO) -#logger.setLevel(logging.DEBUG) +# logger.setLevel(logging.INFO) +# logger.setLevel(logging.DEBUG) + +# create the logging file handler +fh = logging.FileHandler("cipher.log") +formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s') +fh.setFormatter(formatter) + +# add handler to logger object +logger.addHandler(fh) + from cipher import * from language_models import * @@ -199,23 +210,27 @@ def keyword_break_worker(message, keyword, wrap_alphabet, fitness): return (keyword, wrap_alphabet), fit def monoalphabetic_break_hillclimbing(message, max_iterations=10000000, - fitness=Pletters): + alphabet=None, fitness=Pletters): ciphertext = unaccent(message).lower() - alphabet = list(string.ascii_lowercase) - random.shuffle(alphabet) - alphabet = ''.join(alphabet) + if not alphabet: + alphabet = list(string.ascii_lowercase) + random.shuffle(alphabet) + alphabet = cat(alphabet) return monoalphabetic_break_hillclimbing_worker(ciphertext, alphabet, max_iterations, fitness) def monoalphabetic_break_hillclimbing_mp(message, workers=10, - max_iterations = 10000000, fitness=Pletters, chunksize=1): + max_iterations = 10000000, alphabet=None, fitness=Pletters, chunksize=1): worker_args = [] ciphertext = unaccent(message).lower() for i in range(workers): - alphabet = list(string.ascii_lowercase) - random.shuffle(alphabet) - alphabet = ''.join(alphabet) - worker_args.append((ciphertext, alphabet, max_iterations, fitness)) + if alphabet: + this_alphabet = alphabet + else: + this_alphabet = list(string.ascii_lowercase) + random.shuffle(this_alphabet) + this_alphabet = cat(this_alphabet) + worker_args.append((ciphertext, this_alphabet, max_iterations, fitness)) with Pool() as pool: breaks = pool.starmap(monoalphabetic_break_hillclimbing_worker, worker_args, chunksize) @@ -286,7 +301,7 @@ def vigenere_frequency_break(message, max_key_length=20, fitness=Pletters): """ def worker(message, key_length, fitness): splits = every_nth(sanitised_message, key_length) - key = ''.join([chr(caesar_break(s)[0] + ord('a')) for s in splits]) + key = cat([chr(caesar_break(s)[0] + ord('a')) for s in splits]) plaintext = vigenere_decipher(message, key) fit = fitness(plaintext) return key, fit @@ -310,7 +325,7 @@ def beaufort_frequency_break(message, max_key_length=20, fitness=Pletters): """ def worker(message, key_length, fitness): splits = every_nth(sanitised_message, key_length) - key = ''.join([chr(-caesar_break(s)[0] % 26 + ord('a')) + key = cat([chr(-caesar_break(s)[0] % 26 + ord('a')) for s in splits]) plaintext = beaufort_decipher(message, key) fit = fitness(plaintext) @@ -355,7 +370,7 @@ def column_transposition_break_mp(message, translist=transpositions, with Pool() as pool: helper_args = [(message, trans, fillcolumnwise, emptycolumnwise, fitness) - for trans in translist.keys() + for trans in translist for fillcolumnwise in [True, False] for emptycolumnwise in [True, False]] # Gotcha: the helper function here needs to be defined at the top level @@ -465,6 +480,9 @@ def railfence_break(message, max_key_length=20, return max(results, key=lambda k: k[1]) def amsco_break(message, translist=transpositions, patterns = [(1, 2), (2, 1)], + fillstyles = [AmscoFillStyle.continuous, + AmscoFillStyle.same_each_row, + AmscoFillStyle.reverse_each_row], fitness=Pbigrams, chunksize=500): """Breaks an AMSCO transposition cipher using a dictionary and @@ -482,7 +500,7 @@ def amsco_break(message, translist=transpositions, patterns = [(1, 2), (2, 1)], (5, 0, 6, 1, 3, 4, 2): ['fourteen'], \ (6, 1, 0, 4, 5, 3, 2): ['keyword']}, \ patterns=[(1, 2)]) # doctest: +ELLIPSIS - (((2, 0, 5, 3, 1, 4, 6), (1, 2)), -709.4646722...) + (((2, 0, 5, 3, 1, 4, 6), (1, 2), ), -709.4646722...) >>> amsco_break(amsco_transposition_encipher(sanitise( \ "It is a truth universally acknowledged, that a single man in \ possession of a good fortune, must be in want of a wife. However \ @@ -495,27 +513,29 @@ def amsco_break(message, translist=transpositions, patterns = [(1, 2), (2, 1)], (5, 0, 6, 1, 3, 4, 2): ['fourteen'], \ (6, 1, 0, 4, 5, 3, 2): ['keyword']}, \ patterns=[(1, 2), (2, 1)], fitness=Ptrigrams) # doctest: +ELLIPSIS - (((2, 0, 5, 3, 1, 4, 6), (2, 1)), -997.0129085...) + (((2, 0, 5, 3, 1, 4, 6), (2, 1), ), -997.0129085...) """ with Pool() as pool: - helper_args = [(message, trans, pattern, fitness) - for trans in translist.keys() - for pattern in patterns] + helper_args = [(message, trans, pattern, fillstyle, fitness) + for trans in translist + for pattern in patterns + for fillstyle in fillstyles] # Gotcha: the helper function here needs to be defined at the top level # (limitation of Pool.starmap) breaks = pool.starmap(amsco_break_worker, helper_args, chunksize) return max(breaks, key=lambda k: k[1]) def amsco_break_worker(message, transposition, - pattern, fitness): + pattern, fillstyle, fitness): plaintext = amsco_transposition_decipher(message, transposition, - fillpattern=pattern) + fillpattern=pattern, fillstyle=fillstyle) fit = fitness(sanitise(plaintext)) logger.debug('AMSCO transposition break attempt using key {0} and pattern' - '{1} gives fit of {2} and decrypt starting: {3}'.format( - transposition, pattern, fit, + '{1} ({2}) gives fit of {3} and decrypt starting: ' + '{4}'.format( + transposition, pattern, fillstyle, fit, sanitise(plaintext)[:50])) - return (transposition, pattern), fit + return (transposition, pattern, fillstyle), fit def hill_break(message, matrix_size=2, fitness=Pletters, @@ -549,6 +569,43 @@ def hill_break_worker(message, matrix, fitness): fit, sanitise(plaintext)[:50])) return matrix, fit +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', , 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', , 0), -52.834575011...), + (('elephant', , 0), -52.834575011...)] + """ + with 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 + def pocket_enigma_break_by_crib(message, wheel_spec, crib, crib_position): """Break a pocket enigma using a crib (some plaintext that's expected to @@ -579,13 +636,13 @@ def pocket_enigma_break_by_crib(message, wheel_spec, crib, crib_position): def plot_frequency_histogram(freqs, sort_key=None): - x = range(len(freqs.keys())) - y = [freqs[l] for l in sorted(freqs.keys(), key=sort_key)] + x = range(len(freqs)) + y = [freqs[l] for l in sorted(freqs, key=sort_key)] f = plt.figure() ax = f.add_axes([0.1, 0.1, 0.9, 0.9]) ax.bar(x, y, align='center') ax.set_xticks(x) - ax.set_xticklabels(sorted(freqs.keys(), key=sort_key)) + ax.set_xticklabels(sorted(freqs, key=sort_key)) f.show()