def __init__(self, parent):
""" Create a new VigenereCipherAnalyzer instance.
Args:
parent: a class that provides an interafce to CryptographyStudio
"""
super().__init__(parent)
self._widget.show_all()
ngram_loader = NGramLoader()
ngram_loader.load("hr.json")
self._letter_freqs = ngram_loader.get_ngrams(1)
def __init__(self, parent):
""" Create a new ColumnTranspositionCipher instance.
Args:
parent: a class that provides an interafce to CryptographyStudio
"""
super().__init__(parent)
self._key_length = 1
self._cipher = ColumnTranspositionCipher(parent)
self._widget.show_all()
ngram_loader = NGramLoader()
ngram_loader.load("hr.json")
self._bigram_freqs = ngram_loader.get_ngrams(2)
self._update_key_length()
def __init__(self, parent):
""" Create a new VigenereCipherAnalyzer instance.
Args:
parent: a class that provides an interafce to CryptographyStudio
"""
super().__init__(parent)
self._cipher = VigenereCipher(parent)
self._widget.show_all()
key_path = path.join(self.GLADE_LOCATION, "resources", self.KEY_GLADE)
with open(key_path, "r") as fp:
self._key_selector_buffer = fp.read()
ngram_loader = NGramLoader()
ngram_loader.load("hr.json")
self._letter_freqs = ngram_loader.get_ngrams(1)
self._update_key_length()
def __init__(self, parent):
""" Create a new NGramAnalyzer instance.
Args:
parent: a class that provides an interafce to CryptographyStudio
"""
super().__init__(parent)
self._ngram_loader = NGramLoader()
class NGramAnalyzer(WidgetController, LanguageAnalyzer):
""" This class compares the frequencies of n-grams in the decrypted text
and selected language and displays them in a Gtk.TreeView.
Args:
GLADE_LOCATION: string, path to de "resources" folder containing the
.glade file for this widget
NGRAM_SELECTOR_ID: string, id of the widget allowing the user to select
the size of the n-grams (ie. "n")
REFRESH_BUTTON_ID: string, id of the button that refreshes the widget
NGRAM_STORE_ID: string, id of the Gtk.ListStore that holds the data
about n-gram frequencies
"""
GLADE_LOCATION = path.dirname(__file__)
NGRAM_SELECTOR_ID = "ngram_selector"
REFRESH_BUTTON_ID = "refresh_button"
NGRAM_STORE_ID = "ngram_store"
def __init__(self, parent):
""" Create a new NGramAnalyzer instance.
Args:
parent: a class that provides an interafce to CryptographyStudio
"""
super().__init__(parent)
self._ngram_loader = NGramLoader()
def _load_gui_objects(self):
""" Save references to required objects defined in the .glade file. """
super()._load_gui_objects()
self._ngram_selector = self._builder.get_object(self.NGRAM_SELECTOR_ID)
self._refresh_button = self._builder.get_object(self.REFRESH_BUTTON_ID)
self._ngram_store = self._builder.get_object(self.NGRAM_STORE_ID)
def _connect_handlers(self):
""" Connect signals with their handler methods. """
super()._connect_handlers()
self._refresh_button.connect("clicked", self._refresh_data)
self._ngram_selector.connect("value-changed", self._refresh_data)
def _refresh_data(self, *args):
""" A handler that refreshes the n-gram frequnecies of the text in the
parent's plaintext view.
Args:
*args: arguments passed from the signal
"""
#TODO: change when multiple-language support is implemented
self._ngram_loader.load("hr.json")
n = self._ngram_selector.get_value_as_int()
ngrams = self._ngram_loader.get_ngrams(n)
self._ngram_store.clear()
try:
max_lang = max(ngrams.values()) or 1
except:
max_lang = 1
text_ngrams = self._add_plaintext_data(ngrams, n)
try:
max_text = max(text_ngrams.values()) or 1
except:
max_text = 1
for ngram, freq in text_ngrams.items():
lfreq = ngrams.get(ngram, 0)
self._ngram_store.append([
ngram,
freq * 100 / max_text, "{:.2%}".format(freq),
lfreq * 100 / max_lang, "{:.2%}".format(lfreq)
])
def _add_plaintext_data(self, ngrams, n):
""" Create a dictionary of ngrams and their frequencies in parent's
plaintext view.
Also includes all n-grams in the ngrams dictionary (with frequencies 0
if they do not appear in the plaintext view).
Args:
ngrams: existing dictionary of n-grams
n: size of the n-grams
Returns:
Dictionary of n-grams as keys and their frequencies as values.
"""
plaintext = ''.join(char
for char in self._parent.get_plaintext().upper()
if char in Permutation.CHARS)
text_ngrams = {key : 0 for key in ngrams}
count = (len(plaintext) - n + 1) or 1
for i in range(0, count):
substr = plaintext[i:i+n]
if substr in text_ngrams:
text_ngrams[substr] += 1
else:
text_ngrams[substr] = 1
for key in text_ngrams:
text_ngrams[key] /= count
return text_ngrams
