import string
import collections
import logging
-from itertools import zip_longest, cycle
-
+from itertools import zip_longest, cycle, chain
+from language_models import *
logger = logging.getLogger(__name__)
logger.addHandler(logging.FileHandler('cipher.log'))
#logger.setLevel(logging.DEBUG)
-modular_division_table = [[0]*26 for x in range(26)]
+modular_division_table = [[0]*26 for _ in range(26)]
for a in range(26):
for b in range(26):
c = (a * b) % 26
modular_division_table[b][c] = a
-def letters(text):
- """Remove all non-alphabetic characters from a text
- >>> letters('The Quick')
- 'TheQuick'
- >>> letters('The Quick BROWN fox jumped! over... the (9lazy) DOG')
- 'TheQuickBROWNfoxjumpedoverthelazyDOG'
- """
- return ''.join([c for c in text if c in string.ascii_letters])
-
-def sanitise(text):
- """Remove all non-alphabetic characters and convert the text to lowercase
-
- >>> sanitise('The Quick')
- 'thequick'
- >>> sanitise('The Quick BROWN fox jumped! over... the (9lazy) DOG')
- 'thequickbrownfoxjumpedoverthelazydog'
- """
- # sanitised = [c.lower() for c in text if c in string.ascii_letters]
- # return ''.join(sanitised)
- return letters(text).lower()
def ngrams(text, n):
"""Returns all n-grams of a text
return ''.join([''.join(l)
for l in zip_longest(*split_text, fillvalue='')])
+def chunks(text, n, fillvalue=None):
+ """Split a text into chunks of n characters
+
+ >>> chunks('abcdefghi', 3)
+ ['abc', 'def', 'ghi']
+ >>> chunks('abcdefghi', 4)
+ ['abcd', 'efgh', 'i']
+ >>> chunks('abcdefghi', 4, fillvalue='!')
+ ['abcd', 'efgh', 'i!!!']
+ """
+ if fillvalue:
+ padding = fillvalue[0] * (n - len(text) % n)
+ else:
+ padding = ''
+ return [(text+padding)[i:i+n] for i in range(0, len(text), n)]
+
def transpose(items, transposition):
"""Moves items around according to the given transposition
transposed[t] = items[p]
return transposed
-
-
def deduplicate(text):
return list(collections.OrderedDict.fromkeys(text))
-
def caesar_encipher_letter(letter, shift):
"""Encipher a letter, given a shift amount
alphabet_start = ord('a')
cipher_number = ord(letter) - alphabet_start
if one_based: cipher_number += 1
- plaintext_number = ( modular_division_table[multiplier]
- [(cipher_number - adder) % 26] )
+ plaintext_number = (
+ modular_division_table[multiplier]
+ [(cipher_number - adder) % 26] )
if one_based: plaintext_number -= 1
return chr(plaintext_number % 26 + alphabet_start)
else:
transpositions = tuple(key.index(l) for l in sorted(key))
return transpositions
-def column_transposition_encipher(message, keyword, fillvalue=' '):
+def pad(message_len, group_len, fillvalue):
+ padding_length = group_len - message_len % group_len
+ if padding_length == group_len: padding_length = 0
+ padding = ''
+ for i in range(padding_length):
+ if callable(fillvalue):
+ padding += fillvalue()
+ else:
+ padding += fillvalue
+ return padding
+
+def column_transposition_encipher(message, keyword, fillvalue=' ',
+ fillcolumnwise=False,
+ emptycolumnwise=False):
"""Enciphers using the column transposition cipher.
Message is padded to allow all rows to be the same length.
-
- >>> column_transposition_encipher('hellothere', 'clever')
- 'hleolteher'
- >>> column_transposition_encipher('hellothere', 'cleverly', fillvalue='!')
- 'hleolthre!e!'
"""
- return column_transposition_worker(message, keyword, encipher=True,
- fillvalue=fillvalue)
+ # >>> column_transposition_encipher('hellothere', 'clever')
+ # 'hleolteher'
+ # >>> column_transposition_encipher('hellothere', 'cleverly', fillvalue='!')
+ # 'hleolthre!e!'
+ # >>> column_transposition_encipher('hellothere', 'clever', columnwise=True)
+ # 'htleehoelr'
+ # """
+ transpositions = transpositions_of(keyword)
+ message += pad(len(message), len(transpositions), fillvalue)
+ if fillcolumnwise:
+ rows = every_nth(message, len(transpositions))
+ else:
+ rows = chunks(mesage, len(transpositions))
+ columns = every_nth(message, len(transpositions), fillvalue=fillvalue)
+ transposed = [transpose(r, transpositions) for r in rows]
+ if emptycolumnwise:
+ return combine_every_nth(transposed)
+ else:
+ return ''.join(chain(*transposed))
-def column_transposition_decipher(message, keyword, fillvalue=' '):
+def column_transposition_decipher(message, keyword, fillvalue=' ',
+ columnwise=False):
"""Deciphers using the column transposition cipher.
Message is padded to allow all rows to be the same length.
-
- >>> column_transposition_decipher('hleolteher', 'clever')
- 'hellothere'
- >>> column_transposition_decipher('hleolthre!e!', 'cleverly', fillvalue='?')
- 'hellothere!!'
- """
- return column_transposition_worker(message, keyword, encipher=False,
- fillvalue=fillvalue)
-
-def column_transposition_worker(message, keyword,
- encipher=True, fillvalue=' '):
- """Does the actual work of the column transposition cipher.
- Message is padded with spaces to allow all rows to be the same length.
-
- >>> column_transposition_worker('hellothere', 'clever')
- 'hleolteher'
- >>> column_transposition_worker('hellothere', 'clever', encipher=True)
- 'hleolteher'
- >>> column_transposition_worker('hleolteher', 'clever', encipher=False)
- 'hellothere'
"""
+ # >>> column_transposition_decipher('hleolteher', 'clever')
+ # 'hellothere'
+ # >>> column_transposition_decipher('hleolthre!e!', 'cleverly', fillvalue='?')
+ # 'hellothere!!'
+ # >>> column_transposition_decipher('htleehoelr', 'clever', columnwise=True)
+ # 'hellothere'
+ # """
transpositions = transpositions_of(keyword)
- columns = every_nth(message, len(transpositions), fillvalue=fillvalue)
- if encipher:
- transposed_columns = transpose(columns, transpositions)
+ if columnwise:
+ columns = chunks(message, int(len(message) / len(transpositions)))
else:
- transposed_columns = untranspose(columns, transpositions)
- return combine_every_nth(transposed_columns)
+ columns = every_nth(message, len(transpositions), fillvalue=fillvalue)
+ untransposed_columns = untranspose(columns, transpositions)
+ return combine_every_nth(untransposed_columns)
+
def vigenere_encipher(message, keyword):
"""Vigenere encipher
pairs = zip(message, cycle(shifts))
return ''.join([caesar_decipher_letter(l, k) for l, k in pairs])
+beaufort_encipher=vigenere_decipher
+beaufort_decipher=vigenere_encipher
if __name__ == "__main__":